HONDA WH15X User Manual

Owner’s Manual

Black

DIC F101

WATER PUMP

WH15X/WH20X

o2001-2007 Honda Motor Co., Ltd. -All Rights Reserved

The engine exhaust from this product
contains chemicals known to the State
of California to cause cancer, birth
defects or other reproductive harm.

Keep this owner’s manual handy, so you can refer to it at any time.
This owner’s manual is considered a permanent part of the water
pump and should remain with the water pump if resold.

The information and specifications included in this publication were in
effect at the time of approval for printing. Honda Motor Co., Ltd.
reserves the right, however, to discontinue or change specifications or
design at any time without notice and without incurring any obligation
whatever. No part of this publication may be reproduced without
written permission.

INTRODUCTION

Congratulations on your selection of a Honda water pump. We are
certain you will be pleased with your purchase of one of the finest
water pumps on the market.

We want to help you get the best results from your new water pump
and to operate it safely. This manual contains the information on how
to do that; please read it carefully.

As you read this manual, you will find information preceded by a

symbol. That information is intended to help you avoid

damage to your water pump, other property, or the environment.

We suggest you read the warranty policy to fully understand its
coverage and your responsibilities of ownership. The warranty policy
is a separate document that should have been given to you by your
dealer.

When your water pump needs scheduled maintenance, keep in mind
that your Honda servicing dealer is specially trained in servicing
Honda water pumps. Your Honda servicing dealer is dedicated to your
satisfaction and will be pleased to answer your questions and
concerns.

Best Wishes,
Honda Motor Co., Ltd.

1

INTRODUCTION

A FEW WORDS ABOUT SAFETY

Your safety and the safety of others are very important. And using this
water pump safely is an important responsibility.

To help you make informed decisions about safety, we have provided
operating procedures and other information on labels and in this
manual. This information alerts you to potential hazards that could
hurt you or others.

Of course, it is not practical or possible to warn you about all the
hazards associated with operating or maintaining a water pump. You
must use your own good judgment.

You will find important safety information in a variety of forms,
including:

Safety Labels

Safety Messages

of three signal words, DANGER, WARNING, or CAUTION.

These signal words mean:

Safety Headings

Safety Section

Instructions

This entire book is filled with important safety information –– please
read it carefully.

–– on the pump.

–– preceded by a safety alert symbol and one

You WILL be KILLED or SERIOUSLY HURT if
you don’t follow instructions.

You CAN be KILLED or SERIOUSLY HURT if
you don’t follow instructions.

You CAN be HURT if you don’t follow
instructions.

–– such as

–– such as

–– how to use this pump correctly and safely.

IMPORTANT SAFETY INFORMATION

PUMP SAFETY

.

.

2

CONTENTS

..........................................................................................PUMP SAFETY . 5

CONTROLS

............................................................................................CONTROLS . 9

.....................................................................................Choke Lever . 10

............................................................................................OPERATION . 15

................................................IMPORTANT SAFETY INFORMATION . 5

................................................................SAFETY LABEL LOCATIONS . 7

............................................COMPONENT & CONTROL LOCATIONS . 8

................................................................................Fuel Valve Lever . 9

...................................................................................Ignition Switch . 9

..................................................................................Throttle Lever . 10

...........................................................................Recoil Starter Grip . 11

.............................................................................BEFORE OPERATION . 12

...............................................ARE YOU READY TO GET STARTED? . 12

........................................................IS YOUR PUMP READY TO GO? . 13

....................................Check the General Condition of the Pump . 13

.......................................Check the Suction and Discharge Hoses . 14

.............................................................................Check the Engine . 14

...................................................SAFE OPERATING PRECAUTIONS . 15

............................................................................PUMP PLACEMENT . 16

.......................................................SUCTION HOSE INSTALLATION . 17

..................................................DISCHARGE HOSE INSTALLATION . 18

...........................................................................PRIMING THE PUMP . 18

....................................................................STARTING THE ENGINE . 19

...................................................................SETTING ENGINE SPEED . 21

....................................................................STOPPING THE ENGINE . 22

.......................................................................SERVICING YOUR PUMP . 24

............................................THE IMPORTANCE OF MAINTENANCE . 24

....................................................................MAINTENANCE SAFETY . 25

..............................................................MAINTENANCE SCHEDULE . 26

..........................................................................................REFUELING . 27

.............................................................FUEL RECOMMENDATIONS . 28

................................................................ENGINE OIL LEVEL CHECK . 29

.........................................................................ENGINE OIL CHANGE . 30

..................................................ENGINE OIL RECOMMENDATIONS . 31

3

CONTENTS

SERVICING YOUR PUMP (continued)

....................................................................AIR FILTER INSPECTION . 32

.......................................................................AIR FILTER CLEANING . 33

...............................................................SEDIMENT CUP CLEANING . 34

.......................................................................SPARK PLUG SERVICE . 35

...............................................................IDLE SPEED ADJUSTMENT . 37

................................................................................................STORAGE . 39

..................................................................STORAGE PREPARATION . 39

...........................................................................................Cleaning . 39

...................................................................................................Fuel . 40

.........................................................................................Engine Oil . 43

.................................................................STORAGE PRECAUTIONS . 43

..............................................................REMOVAL FROM STORAGE . 44

.....................................................................................TRANSPORTING . 45

................................................................................................ENGINE . 46

......................................................................Engine Will Not Start . 46

........................................................................Engine Lacks Power . 46

...................................................................................................PUMP . 47

.............................................................................No Pump Output . 47

...........................................................................Low Pump Output . 47

.........................SPARK ARRESTER SERVICE (optional equipment) . 38

.....................................TAKING CARE OF UNEXPECTED PROBLEMS . 46

4

........................................TECHNICAL & CONSUMER INFORMATION . 48

...............................................................TECHNICAL INFORMATION . 48

..................................................................Serial Number Location . 48

..................Carburetor Modification for High Altitude Operation . 49

..........................................Emission Control System Information . 50

...........................................................................................Air Index . 52

..................................................................................Specifications . 53

..............................................................CONSUMER INFORMATION . 57

.........................................................................Honda Publications . 57

.......................................................Customer Service Information . 58

...........................QUICK REFERENCE INFORMATION . Inside back cover

PUMP SAFETY

IMPORTANT SAFETY INFORMATION

Honda WH15X and WH20X pumps are designed to pump only water
that is not intended for human consumption, and other uses can result
in injury to the operator or damage to the pump and other property.

Most accidents can be prevented if you follow all instructions in this
manual and on the pump. The most common hazards are discussed
below, along with the best way to protect yourself and others.

Operator Responsibility

It is the operator’s responsibility to provide the necessary safeguards
to protect people and property. Know how to stop the pump quickly in
case of emergency. If you leave the pump for any reason, always turn
the engine off. Understand the use of all controls and connections.

Be sure that anyone who operates the pump receives proper
instruction. Do not let children operate the pump. Keep children and
pets away from the area of operation.

Pump Operation

Pump only water that is not intended for human consumption.
Pumping flammable liquids, such as gasoline or fuel oils, can result in
a fire or explosion, causing serious injury. Pumping sea water,
beverages, acids, chemical solutions, or any other liquid that
promotes corrosion can damage the pump.

Refuel With Care

Gasoline is extremely flammable, and gasoline vapor can explode.
Refuel outdoors, in a well-ventilated area, with the engine stopped and
the pump on a level surface. Do not fill the fuel tank above the fuel
strainer shoulder. Never smoke near gasoline, and keep other flames
and sparks away. Always store gasoline in an approved container.
Make sure that any spilled fuel has been wiped up before starting the
engine.

5

PUMP SAFETY

Hot Exhaust

The muffler becomes very hot during operation and remains hot for a
while after stopping the engine. Be careful not to touch the muffler
while it is hot. Let the engine cool before transporting the pump or
storing it indoors.

To prevent fire hazards, keep the pump at least 3 feet (1 meter) away
from building walls and other equipment during operation. Do not
place flammable objects close to the engine.

Carbon Monoxide Hazard

Exhaust gas contains poisonous carbon monoxide. Avoid inhalation of
exhaust gas. Never run the engine in a closed garage or confined area.

6

PUMP SAFETY

SAFETY LABEL LOCATIONS

The labels shown here contain important safety information. Please
read them carefully. These labels are considered permanent parts of
your pump. If a label comes off or becomes hard to read, contact an
authorized Honda servicing dealer for a replacement.

PUMP CAUTION LABEL

7

CONTROLS

COMPONENT & CONTROL LOCATIONS

WH20X

＜＞

FUEL FILLER CAPCARRYING HANDLE

MUFFLER

FUEL VALVE LEVER

IGNITION SWITCH

AIR CLEANER

THROTTLE LEVER

CHOKE LEVER

STARTER GRIP

OIL DRAIN PLUG

PRIMING WATER FILLER CAP

DISCHARGE PORT

SUCTION PORT

OIL FILLER CAP/DIPSTICK

8

STRAINER

PUMP DRAIN PLUG

CONTROLS

Fuel Valve Lever

CONTROLS

The fuel valve opens and closes
the connection between the fuel
tank and the carburetor.

The fuel valve lever must be in the
ON position for the engine to run.

When the engine is not in use,
leave the fuel valve lever in the
OFF position to prevent
carburetor flooding and to reduce
the possibility of fuel leakage.

Ignition Switch

The ignition switch controls the
ignition system.

The ignition switch must be in the
ON position for the engine to run.

Turning the ignition switch to the
OFF position stops the engine.

FUEL VALVE LEVER

ON

OFF

IGNITION SWITCH

OOFFFF

ON

9

CONTROLS

Choke Lever

The choke lever opens and closes
the choke valve in the carburetor.

The CLOSED position enriches
the fuel mixture for starting a cold
engine.

The OPEN position provides the
correct fuel mixture for operation
after starting, and for restarting a
warm engine.

Throttle Lever

The throttle lever controls engine
speed.

Moving the throttle lever in the
directions shown makes the
engine run faster or slower.

Pump output is controlled by
adjusting the throttle lever. At
maximum throttle position, the
pump will deliver the highest
output volume. Moving the
throttle lever toward the idle
position will decrease the output
volume of the pump.

CCLLOOSSEEDD

THROTTLE LEVER

CHOKE LEVER

OPEN

SLOW

FAST

10

CONTROLS

Recoil Starter Grip

Pulling the starter grip operates the recoil starter to crank the engine
for starting.

STARTER GRIP

11

BEFORE OPERATION

ARE YOU READY TO GET STARTED?

Your safety is your responsibility. A little time spent in preparation will
significantly reduce your risk of injury.

Knowledge

Read and understand this manual. Know what the controls do and
how to operate them.

Familiarize yourself with the pump and its operation before you begin
pumping. Know what to do in case of emergencies.

Be sure of what you are pumping. This pump is designed to pump
only fresh water that is not intended for human consumption.

12

BEFORE OPERATION

IS YOUR PUMP READY TO GO?

For your safety, and to maximize the service life of your equipment, it
is very important to take a few moments before you operate the pump
to check its condition. Be sure to take care of any problem you find, or
have your servicing dealer correct it, before you operate the pump.

Improperly maintaining this pump,
or failing to correct a problem
before operation, could cause a
malfunction in which you could be
seriously injured.

Always perform a preoperation
inspection before each operation,
and correct any problem.

Exhaust gas contains poisonous carbon monoxide. Avoid inhalation of
exhaust gas. Never run the engine in a closed garage or confined area.

To prevent fire hazards, keep the pump at least 3 feet (1 meter) away
from building walls and other equipment during operation. Do not
place flammable objects close to the engine.

Before beginning your preoperation checks, be sure the pump is on a
level surface and the ignition switch is in the OFF position.

Check the General Condition of the Pump

Look around and underneath the pump for signs of oil or gasoline
leaks.

Remove any excessive dirt or debris, especially around the engine
muffler, and recoil starter.

Look for signs of damage.

Check that all nuts, bolts, screws, hose connectors and clamps are
tightened.

13

BEFORE OPERATION

Check the Suction and Discharge Hoses

Check the general condition of the hoses. Be sure the hoses are in
serviceable condition before connecting them to the pump.
Remember that the suction hose must be reinforced construction to
prevent hose collapse.

Check that the sealing washer in the suction hose connector is in
good condition (see page ).

Check that the hose connectors and clamps are securely installed
(see pages and ).

Check that the strainer is in good condition and is installed on the
suction hose (see page ).

Check the Engine

17

18

17

17

Check the engine oil level (see page ). Running the engine with a
low oil level can cause engine damage.

Check the air filter (see page ). A dirty air filter will restrict air flow
to the carburetor, reducing engine and pump performance.

Check the fuel level (see page ). Starting with a full tank will help
to eliminate or reduce operating interruptions for refueling.

32

27

29

14

OPERATION

SAFE OPERATING PRECAUTIONS

To safely realize the full potential of this pump, you need a complete
understanding of its operation and a certain amount of practice with
its controls.

Before operating the pump for the first time, please review the

IMPORTANT SAFETY INFORMATION
BEFORE OPERATION

For your safety, avoid starting or operating the engine in an enclosed
area, such as a garage. Your engine’s exhaust contains poisonous
carbon monoxide gas which can collect rapidly in an enclosed area
and cause illness or death.

Pump only fresh water that is not intended for human consumption.
Pumping flammable liquids, such as gasoline or fuel oils, can result in
a fire or explosion, causing serious injury. Pumping sea water,
beverages, acids, chemical solutions, or any other liquid that
promotes corrosion can damage the pump.

.

on page and the chapter titled

5

15

OPERATION

PUMP PLACEMENT

For best pump performance, place the pump near the water level, and
use hoses that are no longer than necessary. That will enable the
pump to produce the greatest output with the least self-priming time.

As

head

Maximum head specifications and pump performance curves are
shown in the tables on pages and . The length, type, and size of
the suction and discharge hoses can also significantly affect pump
output.

Discharge head capability is always greater than suction head
capability, so it is important for suction head to be the shorter part of
total head.

Minimizing suction head (placing the pump near the water level) is
also very important for reducing self-priming time. Self-priming time
is the time it takes the pump to bring water the distance of the suction
head during initial operation.

(pumping height) increases, pump output decreases.

55 57

DISCHARGE
HEAD

16

SUCTION
HEAD

TTOOTTAALL HHEEAADD

OPERATION

SUCTION HOSE INSTALLATION

Use the commercially available hose and hose connector with the
hose clamp provided with the pump. The suction hose must be
reinforced with a noncollapsible wall or braided wire construction.

The suction hose should be no longer than necessary. Pump
performance is best when the pump is near the water level, and the
hoses are short.

Use a hose clamp to securely fasten the hose connector to the suction
hose in order to prevent air leakage and loss of suction. Verify that the
hose connector sealing washer is in good condition.

Install the strainer (provided with the pump) on the other end of the
suction hose, and secure it with a hose clamp. The strainer will help to
prevent the pump from becoming clogged or damaged by debris.

Securely tighten the hose connector on the pump suction port.

SUCTION PORT

HOSE CONNECTOR
(commercially available)

HOSE CONNECTOR

HOSE CLAMP

SEALING WASHER

SUCTION HOSE

HOSE COUPLER

HOSE CLAMP RING
(commercially available)

HOSE CLAMP

SUCTION HOSE
(commercially
available)

STRAINER

HOSE CLAMP

17

OPERATION

DISCHARGE HOSE INSTALLATION

Use a commercially available
hose and hose connector, and
clamp provided with the pump.

DISCHARGE HOSE
(commercially
available)

HOSE CONNECTOR
(commercially available)

It is best to use a short, large-dia­meter hose, because that will
reduce fluid friction and improve
pump output. A long or small­diameter hose will increase fluid
friction and reduce pump output.

Tighten the hose clamp securely
to prevent the discharge hose
from disconnecting under high

HOSE CLAMP

pressure.

PRIMING THE PUMP

Before starting the engine, remove the filler cap from the pump
chamber, and completely fill the pump chamber with water. Reinstall
the filler cap, and tighten it securely.

Operating the pump dry will destroy the pump seal. If the pump has
been operated dry, stop the engine immediately, and allow the pump
to cool before priming.

18

PRIMING WATER FILLER CAP

STARTING THE ENGINE

OPERATION

Prime the pump (see page ).

1.

Move the fuel valve lever to the ON position.

2.

To start a cold engine, move the choke lever to the CLOSED position.

3.

18

FFUUEELL VVAALLVVEE LLEEVVEERR

ON

To restart a warm engine, leave the choke lever in the OPEN position.

CHOKE LEVER

CLOSED

Move the throttle lever away from the SLOW position about 1/3 of

4.
the way toward the FAST position.

THROTTLE LEVER

19

OPERATION

Turn the ignition switch to the ON position.

5.

IGNITION SWITCH

ON

Pull the starter grip lightly until you feel resistance, then pull briskly

6.
in the direction of the arrow as shown below.
Do not allow the starter grip to snap back against the engine. Return
it gently to prevent damage to the starter.

20

STARTER GRIP

Directiontopull

OPERATION

If the choke lever was moved to the CLOSED position to start the

7.
engine, gradually move it to the OPEN position as the engine warms
up.

CHOKE LEVER

OPEN

SETTING ENGINE SPEED

After starting the engine, move the throttle lever to the FAST position
for self-priming, and check pump output.

Pump output is controlled by adjusting engine speed. Moving the
throttle lever in the FAST direction will increase pump output, and
moving the throttle lever in the SLOW direction will decrease pump
output.

THROTTLE LEVER

SLOW

FAST

21

OPERATION

STOPPING THE ENGINE

To stop the engine in an emergency, simply turn the ignition switch to
the OFF position. Under normal conditions, use the following
procedure.

Move the throttle lever to the SLOW position.

1.

THROTTLE LEVER

SLOW

Turn the ignition switch to the OFF position.

2.

IGNITION SWITCH

22

OOFFFF

Turn the fuel valve lever to the OFF position.

3.

OPERATION

FUEL VALVE LEVER

After use, remove the pump drain plug (see page ), and drain the
pump chamber. Remove the filler cap, and flush the pump chamber
with clean, fresh water. Allow the water to drain from the pump
chamber, then reinstall the filler cap and drain plug.

OFF

40

23

SERVICING YOUR PUMP

THE IMPORTANCE OF MAINTENANCE

Good maintenance is essential for safe, economical, and trouble-free
operation. It will also help reduce air pollution.

Improperly maintaining this pump,
or failure to correct a problem
before operation, can cause a
malfunction in which you can be
seriously hurt or killed.

Always follow the inspection and
maintenance recommendations and
schedules in this owner’s manual.

To help you properly care for your pump, the following pages include
a maintenance schedule, routine inspection procedures, and simple
maintenance procedures using basic hand tools. Other service tasks
that are more difficult, or require special tools, are best handled by
professionals and are normally performed by a Honda technician or
other qualified mechanic.

The maintenance schedule applies to normal operating conditions. If
you operate your pump under severe conditions, such as sustained
high-load or high-temperature operation, or use in unusually wet or
dusty conditions, consult your servicing dealer for recommendations
applicable to your individual needs and use.

Remember that your servicing dealer knows your pump best and is
fully equipped to maintain and repair it.

To ensure the best quality and reliability, use only new, Honda
Genuine parts or their equivalents for repair and replacement.

Maintenance, replacement, or repair of emission control devices and
systems may be performed by any engine repair establishment or
individual, using parts that are ‘‘certified’’ to EPA standards.

24

SERVICING YOUR PUMP

MAINTENANCE SAFETY

Some of the most important safety precautions follow. However, we
cannot warn you of every conceivable hazard that can arise in
performing maintenance. Only you can decide whether or not you
should perform a given task.

Failure to properly follow
maintenance instructions and
precautions can cause you to be
seriously hurt or killed.

Always follow the procedures and
precautions in the owner’s manual.

Safety Precautions

Make sure the engine is off before you begin any maintenance or
repairs. This will eliminate several potential hazards:

−

Carbon monoxide poisoning from engine exhaust.

Be sure there is adequate ventilation whenever you operate the
engine.

−

Burns from hot parts.

Let the engine and exhaust system cool before touching.

−

Injury from moving parts.

Do not run the engine unless instructed to do so.

Read the instructions before you begin, and make sure you have the
tools and skills required.

To reduce the possibility of fire or explosion, be careful when
working around gasoline. Use only a nonflammable solvent, not
gasoline, to clean parts. Keep cigarettes, sparks, and flames away
from all fuel-related parts.

25

SERVICING YOUR PUMP

MAINTENANCE SCHEDULE

REGULAR SERVICE PERIOD (3)

ITEM

Perform at every indicated
month or operating hour
interval, whichever comes first.

Engine oil

Air filter

Sediment cup
Spark plug

Spark arrester
(optional part)
Fuel tank and filter
Idle speed
Valve clearance
Combustion
chamber
Fuel tube
Impeller
Impeller clearance
Pump inlet valve

Service more frequently when used in dusty areas.

(1)

These items should be serviced by your servicing dealer, unless you

(2)

Check level
Change
Check
Clean
Clean
Check-Adjust
Replace
Clean

Clean
Check-Adjust
Check-Adjust
Clean

Check
Check
Check
Check

Each

use

○

○

First

month

or

20 Hrs.

○○

After every 500 Hrs (2)

Every 2 years (Replace if necessary) (2)

Every

3 months

or

50 Hrs.

(1)

○

Every

6 months

or

100 Hrs.

○
○

○

(2)

○

have the proper tools and are mechanically proficient. Refer to Honda
shop manual for service procedures.

Every

year

or

300 Hrs.

○

(2)

○

(2)

○

(2)

○

(2)

○

(2)

○

For commercial use, log hours of operation to determine proper

(3)

maintenance intervals.

26

SERVICING YOUR PUMP

REFUELING

With the engine stopped, remove the fuel tank cap and check the fuel
level. Refill the tank if the fuel level is low.

Gasoline is highly flammable and
explosive.

You can be burned or seriously
injured when handling fuel.

Stop the engine and keep heat,
sparks, and flame away.
Handle fuel only outdoors.
Wipe up spills immediately.

MAXIMUM FUEL LEVEL

27

SERVICING YOUR PUMP

Refuel in a well-ventilated area before starting the engine. If the engine
has been running, allow it to cool. Refuel carefully to avoid spilling fuel.
Do not fill the fuel tank above the fuel strainer shoulder.

Never refuel the engine inside a building where gasoline fumes may
reach flames or sparks. Keep gasoline away from appliance pilot lights,
barbecues, electric appliances, power tools, etc.

Spilled fuel is not only a fire hazard, it causes environmental damage.
Wipe up spills immediately.

Fuel can damage paint and plastic. Be careful not to spill fuel when
filling your fuel tank. Damage caused by spilled fuel is not covered
under the

After refueling, tighten the fuel tank cap securely.

FUEL RECOMMENDATIONS

This engine is certified to operate on unleaded gasoline with a pump
octane rating of 86 or higher.

Distributor’s Limited Warranty.

You may use regular unleaded gasoline containing no more than 10%
Ethanol (E10) or 5% Methanol by volume. In addition, Methanol must
contain cosolvents and corrosion inhibitors.

Use of fuels with content of Ethanol or Methanol greater than shown
above may cause starting and/or performance problems. It may also
damage metal, rubber, and plastic parts of the fuel system.

Engine damage or performance problems that result from using a fuel
with percentages of Ethanol or Methanol greater than shown above
are not covered under warranty.

Never use stale or contaminated gasoline or an oil/gasoline mixture.
Avoid getting dirt or water in the fuel tank.

28

SERVICING YOUR PUMP

ENGINE OIL LEVEL CHECK

Check the engine oil level with the engine stopped and in a level
position.

Remove the oil filler cap/dipstick and wipe it clean.

1.

Insert and remove the dipstick without screwing it into the filler neck.

2.
Check the oil level shown on the dipstick.

If the oil level is low, fill to the edge of the oil filler hole with the

3.
recommended oil (see page ).

Screw in the oil filler cap/dipstick securely.

4.

OIL FILLER NECK

31

UPPER LIMIT

OIL FILLER CAP/DIPSTICK

Running the engine with a low oil level can cause engine damage.

29

SERVICING YOUR PUMP

ENGINE OIL CHANGE

Drain the used oil while the engine is warm. Warm oil drains quickly
and completely.

Place a suitable container below the engine to catch the used oil,

1.
then remove the oil filler cap/dipstick and the drain plug.

Allow the used oil to drain completely, then reinstall the drain plug,

2.
and tighten it securely.

Please dispose of used motor oil in a manner that is compatible with
the environment. We suggest you take used oil in a sealed container
to your local recycling center or service station for reclamation. Do
not throw it in the trash, pour it on the ground, or down a drain.

With the engine in a level position, fill to the edge of the oil filler hole

3.
with the recommended oil (see page ).

31

Engine oil capacity:

0.63 US qt (0.60

)

Running the engine with a low oil level can cause engine damage.

Screw in the oil filler cap/dipstick securely.

4.

OIL LEVEL

DRAIN PLUG

OIL FILLER CAP/DIPSTICK

30

SERVICING YOUR PUMP

ENGINE OIL RECOMMENDATIONS

Oil is a major factor affecting performance and service life. Use
4-stroke automotive detergent oil.

Use 4-stroke motor oil that meets or exceeds the requirements for API
service category SJ or later (or equivalent). Always check the API
service label on the oil container to be sure it includes the letters SJ or
later (or equivalent).

AMBIENT TEMPERATURE

SAE 10W-30 is recommended for general use. Other viscosities shown
in the chart may be used when the average temperature in your area is
within the recommended range.

31

SERVICING YOUR PUMP

AIR FILTER INSPECTION

Unscrew the wing nut and remove the air cleaner cover. Check the air
filter to be sure it is clean and in good condition.

If the air filter is dirty, clean it as described on page . Replace the air

33

filter if it is damaged.

Reinstall the air filter and air cleaner cover. Be sure all the parts shown
below are in place. Tighten the wing nut securely.

Operating the engine without an air filter, or with a damaged air filter,
will allow dirt to enter the engine, causing rapid engine wear. This type
of damage is not covered by the

AIR CLEANER COVER

AIR FILTER

Distributor’s Limited Warranty.

WING NUT

COVER WASHER

32

GRID

SERVICING YOUR PUMP

AIR FILTER CLEANING

A dirty air filter will restrict air flow to the carburetor, reducing engine
performance. If you operate the pump in very dusty areas, clean the
air filter more frequently than specified in the
(see page ).

1.

Clean the air filter in warm soapy water, rinse, and allow to dry
thoroughly. Or clean in nonflammable solvent and allow to dry.

2.

Dip the air filter in clean engine oil, then squeeze out all excess oil.
The engine will smoke when started if too much oil is left in the
foam.

3.

Wipe dirt from the air cleaner base and cover, using a moist rag. Be
careful to prevent dirt from entering the carburetor.

26

Maintenance Schedule

AIR FILTER

33

SERVICING YOUR PUMP

SEDIMENT CUP CLEANING

1.

Move the fuel valve lever to the OFF position, then remove the fuel
sediment cup and O-ring.

Gasoline is highly flammable and
explosive.

You can be burned or seriously
injured when handling fuel.

Stop the engine and keep heat,
sparks, and flame away.
Handle fuel only outdoors.
Wipe up spills immediately.

Wash the sediment cup in non-flammable solvent, and dry it

2.
thoroughly.

3.

Place the O-ring in the fuel valve, and install the sediment cup.
Tighten the sediment cup securely.

4.

Move the fuel valve lever to the ON position, and check for leaks.
Replace the O-ring if there is any leakage.

O-RING

SEDIMENT CUP

34

SERVICING YOUR PUMP

SPARK PLUG SERVICE

In order to service the spark plug, you will need a spark plug wrench
(commercially available).

Recommended spark plug: (NGK)

BPR6ES
W20EPR-U

(DENSO)

Incorrect spark plugs can cause engine damage.

1.

Disconnect the spark plug cap, and remove any dirt from around the
spark plug area.

2.

Remove the spark plug with a 13/16-inch spark plug wrench.

SPARK PLUG WRENCH

SPARK PLUG CAP

3.

Inspect the spark plug. Replace it
if the electrodes are worn, or if the
insulator is cracked or chipped.

0.028 0.031 in

−

(0.70 0.80 mm)

−

4.

Measure the spark plug electrode
gap with a suitable gauge.
Correct the gap, if necessary, by
carefullybendingtheside
electrode.
The gap should be:

0.028 0.031 in (0.70 0.80 mm)

−−

5.

Install the spark plug carefully, by hand, to avoid cross-threading.

35

SERVICING YOUR PUMP

After the spark plug seats, tighten with a 13/16-inch spark plug

6.
wrench to compress the washer.

If reinstalling the used spark plug, tighten 1/8 1/4 turn after the
spark plug seats.

If installing a new spark plug, tighten 1/2 turn after the spark plug
seats.

A loose spark plug can overheat and damage the engine.
Overtightening the spark plug can damage the threads in the
cylinder head.

Attach the spark plug cap.

7.

−

36

SERVICING YOUR PUMP

IDLE SPEED ADJUSTMENT

1.

Start the engine outdoors, and allow it to warm up to operating
temperature.

Dry operation will damage the pump seal. Be sure the pump
chamber is filled with water before starting the engine.

Move the throttle lever to its slowest position.

2.

Turn the throttle stop screw to obtain the standard idle speed.

3.

＋

Standard idle speed: 1,400 rpm

200

−

150

THROTTLE STOP SCREW

37

SERVICING YOUR PUMP

SPARK ARRESTER SERVICE (optional equipment)

Your engine is not factory-equipped with a spark arrester. In some
areas, it is illegal to operate an engine without a spark arrester. Check
local laws and regulations. A spark arrester is available from
authorized Honda servicing dealers.

The spark arrester must be serviced every 100 hours to keep it
functioning as designed.

If the engine has been running, the muffler will be very hot. Allow the
muffler to cool before servicing the spark arrester.

1.

Remove the two 8 mm nuts, and remove the muffler.

2.

Remove the four 5 mm self-tapping screws, and remove the muffler
protector from the muffler.

3.

Remove the 4 mm screw from the spark arrester, and remove the
spark arrester from the muffler.

MUFFLER PROTECTOR

5 mm SELF-TAPPING
SCREWS

4 mm SCREW

MUFFLER

SPARK ARRESTER

8 mm NUTS

4.

Use a brush to remove carbon
deposits from the spark arrester
screen. Be careful to avoid
damaging the screen.

The spark arrester must be free
of breaks and holes. Replace
the spark arrester if it is
damaged.

5.

Install the spark arrester, muffler protector, and muffler in the

SPARK ARRESTER SCREEN

reverse order of disassembly.

38

STORAGE

STORAGE PREPARATION

Proper storage preparation is essential for keeping your pump trouble­free and looking good. The following steps will help to keep rust and
corrosion from impairing your pump’s function and appearance, and
will make the engine easier to start when you use the pump again.

Cleaning

1.

Wash the engine and pump.

Wash the engine by hand, and be careful to prevent water from
entering the air cleaner or muffler opening. Keep water away from
controls and all other places that are difficult to dry, as water
promotes rust.

Using a garden hose or pressure washing equipment can force
water into the air cleaner or muffler opening. Water in the air
cleaner will soak the air filter, and water that passes through the
air filter or muffler can enter the cylinder, causing damage.

Water contacting a hot engine can cause damage. If the engine
has been running, allow it to cool for at least half an hour before
washing.

Wipe dry all accessible surfaces.

2.

Fill the pump chamber with clean, fresh water, start the engine

3.
outdoors, and let it run until it reaches normal operating
temperature to evaporate any external water.

Dry operation will damage the pump seal. Be sure the pump
chamber is filled with water before starting the engine.

39

STORAGE

4.

Stop the engine, and allow it to
cool.

5.

Remove the pump drain plug,
andflushthepumpwithclean,
fresh water. Allow the water to
drain from the pump chamber,
then reinstall the drain plug.

6.

After the pump is clean and dry,
touch up any damaged paint,
and coat areas that may rust
with a light film of oil. Lubricate
controls with a silicone spray
lubricant.

Fuel

Gasoline will oxidize and deteriorate in storage. Old gasoline will
cause hard starting, and it leaves gum deposits that clog the fuel
system. If the gasoline in your engine deteriorates during storage, you
may need to have the carburetor and other fuel system components
serviced or replaced.

PUMP DRAIN PLUG

The length of time that gasoline can be left in your fuel tank and
carburetor without causing functional problems will vary with such
factors as gasoline blend, your storage temperatures, and whether the
fuel tank is partially or completely filled. The air in a partially filled fuel
tank promotes fuel deterioration. Very warm storage/temperatures
accelerate fuel deterioration. Fuel deterioration problems may occur
within a few months, or even less if the gasoline was not fresh when
you filled the fuel tank.

The

Distributor’s Limited Warranty

damage or engine performance problems resulting from neglected
storage preparation.

You can extend fuel storage life by adding a fuel stabilizer that is
formulated for that purpose, or you can avoid fuel deterioration
problems by draining the fuel tank and carburetor.

does not cover fuel system

40

STORAGE

Adding a Fuel Stabilizer to Extend Fuel Storage Life

When adding a fuel stabilizer, fill the fuel tank with fresh gasoline. If
only partially filled, air in the tank will promote fuel deterioration
during storage. If you keep a container of gasoline for refueling, be
sure that it contains only fresh gasoline.

Add fuel stabilizer following the manufacturer’s instructions.

1.

After adding a fuel stabilizer, run the engine outdoors for 10 minutes

2.
to be sure that treated gasoline has replaced the untreated gasoline
in the carburetor.

Dry operation will damage the pump seal. Be sure the pump
chamber is filled with water before starting the engine.

Stop the engine, and move the fuel valve lever to the OFF position.3.

FUEL VALVE LEVER

OFF

41

STORAGE

Draining the Fuel Tank and Carburetor

1.

Place an approved gasoline container below the carburetor, and use
a funnel to avoid spilling fuel.

2.

Remove the carburetor drain bolt and sediment cup, then move the
fuel valve lever to the ON position.

Gasoline is highly flammable and
explosive.

You can be burned or seriously
injured when handling fuel.

Keep heat, sparks, and flame
away.
Handle fuel only outdoors.
Wipe up spills immediately.

DRAIN BOLT

3.

After all the fuel has drained into the container, reinstall the drain
bolt and sediment cup. Tighten them securely.

SEDIMENT CUP

42

Engine Oil

STORAGE

1.

Change the engine oil (see page ).

2.

Remove the spark plug (see page ).

3.

Pour a tablespoon (5 10 cc) of clean engine oil into the cylinder.

4.

Pull the starter grip several times to distribute the oil in the cylinder.

5.

Reinstall the spark plug.

6.

Pull the starter grip slowly until resistance is felt and the notch on
the starter pulley aligns with the hole at the top of the recoil starter
cover. This will close the valves so moisture cannot enter the engine
cylinder. Return the starter grip gently.

−

30

35

Align notch on pulley with
hole at top of cover.

STORAGE PRECAUTIONS

If your pump will be stored with gasoline in the fuel tank and
carburetor, it is important to reduce the hazard of gasoline vapor
ignition. Select a well-ventilated storage area away from any appliance
that operates with a flame, such as a furnace, water heater, or clothes
dryer. Also avoid any area with a spark-producing electric motor, or
where power tools are operated.

If possible, avoid storage areas with high humidity, because that
promotes rust and corrosion.

Unless all fuel has been drained from the fuel tank, leave the fuel valve
lever in the OFF position to reduce the possibility of fuel leakage.

43

STORAGE

Place the pump on a level surface. Tilting can cause fuel or oil leakage.

With the engine and exhaust system cool, cover the pump to keep out
dust. A hot engine and exhaust system can ignite or melt some
materials. Do not use sheet plastic as a dust cover. A nonporous cover
will trap moisture around the pump, promoting rust and corrosion.

REMOVAL FROM STORAGE

Check your pump as described in the
this manual.

If the fuel was drained during storage preparation, fill the tank with
fresh gasoline. If you keep a container of gasoline for refueling, be
sure that it contains only fresh gasoline. Gasoline oxidizes and
deteriorates over time, causing hard starting.

If the cylinder was coated with oil during storage preparation, the
engine may smoke briefly at startup. This is normal.

BEFORE OPERATION

chapter of

44

TRANSPORTING

If the pump has been running, allow the engine to cool for at least 15
minutes before loading the pump on the transport vehicle. A hot
engine and exhaust system can burn you and can ignite some
materials.

Keep the pump level when transporting to reduce the possibility of
fuel leakage. Move the fuel valve lever to the OFF position.

45

TAKING CARE OF UNEXPECTED PROBLEMS

ENGINE

CorrectionEngine Will Not Start Possible Cause

1.

Check control
positions.

2.

Check fuel.

3.

Remove and inspect
spark plug.

4.

Take engine to an
authorized Honda
servicing dealer, or
refertoshopmanual.

Fuel valve OFF.

Choke open.

Ignition switch OFF.

Out of fuel.
Bad fuel; pump stored
without treating or
draining gasoline, or
refuel with bad
gasoline.
Spark plug faulty,
fouled, or improperly
gapped.
Spark plug wet with
fuel (flooded engine).

Fuel filter clogged,
carburetor malfunction,
ignition malfunction,
valves stuck, etc.

Move fuel valve lever
to ON position.
Move choke lever to
CLOSED position
unless engine is warm.
Turn ignition switch to
ON.
Refuel (p. 27 )
Drain fuel tank and
carburetor (p. 42 ).
Refuel with fresh
gasoline (p. 27 ).

Clean, gap, or replace
spark plug (p. 35 ).

Dry and reinstall spark
plug. Start engine with
throttle lever in FAST
position.
Replace or repair faulty
components as
necessary.

1.

Check air filter.

2.

Check fuel.

3.

Take engine to an
authorized Honda
servicing dealer, or
refertoshopmanual.

46

Possible CauseEngine Lacks Power Correction

Air filter clogged.

Bad fuel; pump stored
without treating or
draining gasoline, or
refuel with bad
gasoline.
Fuel filter clogged,
carburetor malfunction,
ignition malfunction,
valves stuck, etc.

Clean or replace filter
(p. 33 ).
Drain fuel tank and
carburetor (p. 42 ).
Refuel with fresh
gasoline (p. 27 ).

Replace or repair faulty
components as
necessary.

TAKING CARE OF UNEXPECTED PROBLEMS

PUMP

1.

Check pump
chamber.

2.

Check suction hose.

3.

Measure suction and
discharge head.

4.

Check engine.

Possible Cause CorrectionNo Pump Output

Pump not primed.

Hose collapsed, cut or
punctured.
Strainer not completely
underwater.

Air leak at connector.

Strainer clogged.

Excessive head.

Engine lacks power.

Prime pump (p. 18 )

Replace suction hose
(p. 17 ).
Sink the strainer and
the end of a suction
hose completely
underwater.
Replace sealing washer
if missing or damaged.
Tighten hose connector
and clamp (p. 17 ).
Clean debris from
strainer.
Relocate pump and/or
hoses to reduce head
(p. 16, 55, 57 ).
Seepage46.

Low Pump Output Possible Cause Correction

1.

Check suction hose.

2.

Check discharge
hose.

3.

Measure suction and
discharge head.

4.

Check engine.

Hose collapsed,
damaged, too long, or
diameter too small.
Air leak at connector.

Strainer clogged.

Hose damaged, too
long, or diameter too
small.
Marginal head.

Engine lacks power.

Replace suction hose
(p. 17 ).

Replace sealing washer
if missing or damaged.
Tighten hose connector
and clamp (p. 17 ).
Clean debris from
strainer.
Replace discharge
hose (p. 18 ).

Relocate pump and/or
hoses to reduce head
(p. 16, 55, 57 ).
Seepage46.

47

TECHNICAL & CONSUMER INFORMATION

TECHNICAL INFORMATION

Serial Number Location

WH20X

＜＞

ENGINE SERIAL NUMBER

Record the engine serial number in the space below. You will need this
serial number when ordering parts, and when making technical or
warranty inquiries (see page ).59

Engine serial number:

48

TECHNICAL & CONSUMER INFORMATION

Carburetor Modification for High Altitude Operation

At high altitude, the standard carburetor air-fuel mixture will be too
rich. Performance will decrease, and fuel consumption will increase. A
very rich mixture will also foul the spark plug and cause hard starting.
Operation at an altitude that differs from that at which this engine was
certified, for extended periods of time, may increase emissions.

High altitude performance can be improved by specific modifications
to the carburetor. If you always operate your pump at altitudes above
5,000 feet (1,500 meters), have your servicing dealer perform this car­buretor modification. This engine, when operated at high altitude with
the carburetor modifications for high altitude use, will meet each
emission standard throughout its useful life.

Even with carburetor modification, engine horsepower will decrease
about 3.5% for each 1,000-foot (300-meter) increase in altitude. The
effect of altitude on horsepower will be greater than this if no
carburetor modification is made.

When the carburetor has been modified for high altitude operation,
the air-fuel mixture will be too lean for low altitude use. Operation at
altitudes below 5,000 feet (1,500 meters) with a modified carburetor
may cause the engine to overheat and result in serious engine damage.
For use at low altitudes, have your servicing dealer return the
carburetor to original factory specifications.

49

TECHNICAL & CONSUMER INFORMATION

Emission Control System Information

Source of Emissions

The combustion process produces carbon monoxide, oxides of
nitrogen, and hydrocarbons. Control of hydrocarbons and oxides of
nitrogen is very important because, under certain conditions, they
react to form photochemical smog when subjected to sunlight. Carbon
monoxide does not react in the same way, but it is toxic.

Honda utilizes lean carburetor settings and other systems to reduce
the emissions of carbon monoxide, oxides of nitrogen and
hydrocarbons.

The U.S. and California Clean Air Acts

EPA and California regulations require all manufacturers to furnish
written instructions describing the operation and maintenance of emis­sion control systems.

The following instructions and procedures must be followed in order
to keep the emissions from your Honda engine within the emission
standards.

Tampering and Altering

Tampering with or altering the emission control system may increase
emissions beyond the legal limit. Among those acts that constitute
tampering are:

Removal or alteration of any part of the intake, fuel or exhaust
systems.

Altering or defeating the governor linkage or speed-adjusting
mechanism to cause the engine to operate outside its design
parameters.

50

TECHNICAL & CONSUMER INFORMATION

Problems That May Affect Emissions

If you are aware of any of the following symptoms, have your engine
inspected and repaired by your servicing dealer.

Hard starting or stalling after starting.

Rough idle.

Misfiring or backfiring under load.

Afterburning (backfiring).

Black exhaust smoke or high fuel consumption.

Replacement Parts

The emission control systems on your Honda engine were designed,
built, and certified to conform with EPA and California emission
regulations. We recommend the use of genuine Honda parts
whenever you have maintenance done. These original-design
replacement parts are manufactured to the same standards as the
original parts, so you can be confident of their performance. The use
of replacement parts that are not of the original design and quality
may impair the effectiveness of your emission control system.

A manufacturer of an aftermarket part assumes the responsibility that
the part will not adversely affect emission performance. The
manufacturer or rebuilder of the part must certify that use of the part
will not result in a failure of the engine to comply with emission
regulations.

Maintenance

Follow the maintenance schedule (see page ). Remember that this
schedule is based on the assumption that your machine will be used
for its designed purpose. Sustained high-load or high-temperature
operation, or use in unusually wet or dusty conditions, will require
more frequent service.

26

51

TECHNICAL & CONSUMER INFORMATION

Air Index

An Air Index Information hang tag/label is applied to engines certified
to an emission durability time period in accordance with the
requirements of the California Air Resources Board.

The bar graph is intended to provide you, our customer, the ability to
compare the emissions performance of available engines. The lower
the Air Index, the less pollution.

The durability description is intended to provide you with information
relating the engine’s emission durability period. The descriptive term
indicates the useful life period for the engine’s emission control
system. See your
information.

Emission Control System Warranty

for additional

Descriptive Term
Moderate

Intermediate

Extended

The Air Index Information hang tag must remain on the pump until it is
sold. Remove the hang tag before operating the pump.

Applicable to Emission Durability Period

50 hours (0 80 cc, inclusive)
125 hours (greater than 80 cc)
125 hours (0 80 cc, inclusive)
250 hours (greater than 80 cc)
300 hours (0 80 cc, inclusive)
500 hours (greater than 80 cc)

1000 hours (225 cc and greater)

−

−

−

52

TECHNICAL & CONSUMER INFORMATION

Specifications

WH15X

Dimensions and weight

Length
Width
Height
Dry mass [weight]

Engine

Model
Engine type
Displacement
[bore stroke]
Cooling system
Ignition system
PTO shaft rotation

Tune up

Spark plug gap

Idle speed
Valve clearance
(cold)
Other specifications

16.3 in (415 mm)

14.2 in (360 mm)

15.9 in (405 mm)
49 lbs (22 kg)

GX120K1
4-stroke, overhead valve, single cylinder

7.3 cu-in (118 cc)

×××

[2.4 1.7 in (60.0 42.0 mm)]
Forced air
Transistor magneto
Counterclockwise

−

0.028 0.031 i n

−

(0.70 0.80 mm)

＋

1,400 rpm
Intake:
Exhaust:

200

−

150

±

0.15 0.02 mm

±

0.20 0.02 mm

See page 35.

See page 37.
See shop
manual.

No other adjustments needed.

53

TECHNICAL & CONSUMER INFORMATION

WH15X (continued)

Pump

Suction port diameter
Discharge port diameter
Total head (maximum)
Suction head (maximum)
Discharge capacity (maximum)

Self-priming time

1.6 in (40 mm)

1.6 in (40 mm)
164 ft (50 m)

26.2ft(8m)

105.7 US gal (400
per minute
40 seconds at 16.4 ft (5 m)

)

54

TECHNICAL & CONSUMER INFORMATION

WH20X

Dimensions and weight

Length
Width
Height
Dry mass [weight]

Engine design and performance

Model
Engine type
Displacement
[bore stroke]
Cooling system
Ignition system
PTO shaft rotation

Tune up

Spark plug gap

Idle speed
Valve clearance
(cold)
Other specifications

16.7 in (425 mm)

14.8 in (375 mm)

15.9 in (405 mm)

51.8 lbs (23.5 kg)

GX160K1
4-stroke, overhead valve, single cylinder

9.9 cu-in (163 cc)

×××

[2.7 1.8 in (68.0 45.0 mm)]
Forced air
Transistor magneto
Counterclockwise

0.028 0.031 i n
(0.70 0.80 mm)

1,400 rpm
Intake:
Exhaust:
No other adjustments needed.

−

−

＋

200

−

150

±

0.15 0.02 mm

±

0.20 0.02 mm

See page 35.

See page 37.
See shop
manual.

55

TECHNICAL & CONSUMER INFORMATION

WH20X (continued)

Pump

Suction port diameter
Discharge port diameter
Total head (maximum)
Suction head (maximum)
Discharge capacity (maximum)

Self-priming time

2 in (50 mm)
2 in (50 mm)
164 ft (50 m)

26.2ft(8m)

132.1 US gal (500
per minute
60 seconds at 16.4 ft (5 m)

)

56

TECHNICAL & CONSUMER INFORMATION

CONSUMER INFORMATION

Honda Publications

These publications will give you additional information for
maintaining and repairing your pump. You may order them from your
Honda pump dealer.

Shop Manual

This manual covers complete maintenance and overhaul procedures.
It is intended to be used by a skilled technician.

Parts Catalog

This manual provides complete, illustrated parts lists.

57

TECHNICAL & CONSUMER INFORMATION

Customer Service Information

Servicing dealership personnel are trained professionals. They should
be able to answer any question you may have. If you encounter a
problem that your dealer does not solve to your satisfaction, please
discuss it with the dealership’s management. The Service Manager or
General Manager can help. Almost all problems are solved in this way.

If you are dissatisfied with the decision made by the dealership’s
management, contact the Honda Power Equipment Customer
Relations Office. You can write to:

American Honda Motor Co., Inc.
Power Equipment Division
Customer Relations Office
4900 Marconi Drive
Alpharetta, Georgia 30005-8847

Or telephone: [phone]

When you write or call, please give us this information:

Model and serial number (see page )

Name of the dealer who sold the pump to you

Name and address of the dealer who services your pump

Date of purchase

Your name, address and telephone number

A detailed description of the problem

48

58

MEMO

59

MEMO

60

QUICK REFERENCE INFORMATION

Type

Fuel

Capacity

Type

Engine Oil

Capacity
Type

Spark Plug

Gap

Carburetor

Idle speed
Before each
use

Maintenance

First
20 hours
Subsequent

Unleaded gasoline with a pump
octane rating of 86 or higher
(page28)
WH15X:

0.53 US gal (2.0

)

WH20X:

0.82 US gal (3.1

)
SAE 10W-30, API SJ or later (or
equivalent) for general use
(page31)

0.63 US qt (0.60
NGK:
DENSO:

0.028 0.031 in (0.70 0.80 mm)
(page35)
1,400 rpm

BPR6ES

W20EPR-U

−−

＋

200

−

150

)

(page37)
Check engine oil level.
Check air filter.
Change engine oil.

Refer to the maintenance
scheduleonpage26.

31YB7721

Black

DIC F101

00X31-YB7-7210

N

K

2eY1700.2007.05

" Printed in Japan