Parsun T4BM, T5BM, T5.8BM Owner's Manual
OUTBOARD MOTOR
OWNER’S MANUAL
T4BM
T5BM
T5.8BM
SUZHOU PARSUN POWER MACHINE CO., LTD.
Thank you for owning a PARSUN outboard motor.
Thank you for your trust in our company and products.
z PARSUN outboard motors are powerful, economic and safe with advanced technology
and processing technique.
z Please read this manual carefully before operating your outboard motor. A thorough
understanding of the manual will help you to know this product for proper operation,
maintenance and care. This will ensure that your outboard motor is operated well
under various conditions.
z PARSUN seeks continuous improvement in product quality. Therefore, while this
manual contains the most current product information available at the time of printing,
there may be minor discrepancies between your machine and this manual. If there is
any question concerning the manual, please consult your local PARSUN dealer.
z Data, illustrations or explanations in this Owner’s Manual do not constitute base for
any legal claim against our company.
SUZHOU PARSUN POWER MACHINE CO., LTD
Engine Identification Numbers
Outboard motor serial number
The outboard motor serial number is marked on the label. The label can be found on the bracket left
assembly or on the upper part of the bracket swivel.
Record your outboard motor serial number in the spaces provided to assist you in ordering spare parts
from your PARSUN dealer, or for reference in case your outboard motor is stolen.
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1. Outboard motor serial number location
Serial number as follows:
SN
Engine serial number
The engine serial number is carved on the aluminum casting of engine.
Serial number as follows:
Table of contents
1. Main components and General information·············································1
1.1 Main components···································································1
1.2 General information·································································3
1.2.1 Specifications······································································3
1.2.2 Fueling instructions·································································4
1.2.3 Propeller selection·································································5
2. Operation··········································································7
2.1 Installation·········································································7
2.1.1 Mounting height····································································8
2.1.2 Clamping the outboard motor·······················································9
2.2 Breaking in engine·······························································10
2.3 Pre-operation checks·····························································12
2.4 Filling fuel·······································································13
2.5 Starting engine···································································14
2.6 Warming up engine·······························································17
2.7 Shifting··········································································18
2.7.1 Forward·········································································18
2.7.2 Reverse·········································································19
2.8 Tiller·············································································20
2.9 Stopping engine··································································21
2.10 Trimming outboard motor··························································22
2.11 Tilting up and down······························································23
2.11.1 Tilting up········································································24
2.11.2 Tilting down······································································25
2.12 Cruising in other conditions·······················································26
2.12.1 Cruising in shallow water·························································26
2.12.2 Cruising in salt water·····························································26
3 Maintenance·····································································27
3.1 Greasing·········································································27
3.2 Cleaning and adjusting spark plug·················································28
3.3 Checking fuel system·····························································28
3.4 Inspecting idling speed····························································29
3.5 Checking wiring and connectors···················································29
3.6 Checking for leakage·····························································29
3.7 Checking propeller································································30
3.7.1 Removing the propeller···························································31
3.7.2 Installing the propeller····························································31
3.8 Changing gear oil································································32
3.9 Cleaning fuel tank································································33
3.10 Checking and replacing anode(s)··················································34
3.11 Checking top cowling·····························································35
3.12
Maintenance table·······························································36
4. Transporting and storing outboard motor···········································38
4.1 Transporting······································································38
4.2 Storing···········································································39
5. Action in emergency ·····························································42
5.1 Impact damage···································································42
5.2 Starter will not operate····························································42
5.3 Treatment of submerged motor····················································44
6. Troubleshooting····································································46
7. Circuit diagram·····································································50
1. Main components and General information
1.1 Main components
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1
2
3
4
5
6
7
8
9
10
11
14
13
12
16
17
18
1. Top cowling 8. Tiller handle 14. Clamp screw
2. Top cowling lock levers 9. Engine stop button/Engine 15. Choke knob
3. Anti-cavitation plate stop lanyard switch 16. Gear shift lever
4. Propeller 10. Starter handle 17. Trim rod
5. Cooling water inlet 11. Fuel joint 18. Fuel tank
6. Clamp bracket 12. Throttle grip
7. Steering friction screw
13. Throttle friction adjuster
Note:
* The fuel tank is equipped for
the proper model.
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If your model includes a portable fuel tank, its parts are as follows:
2 4
1
3
1. Fuel tank cap 3. Air vent screw
2. Fuel joint 4. Fuel gauge
WARNING
z The fuel tank supplied with this engine could only be used as supply of fuel for its
running and must not be as a fuel storage container.
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1.2 General information
1.2.1 Specifications
Parameter
Items Data Items Data
Type of engine 2-stroke Weight (L) 21Kg
Displacement 102cm3 Transom (S) 381mm
Bore X stroke 55mm×43mm Transom (L) 508mm
Gear ratio
2.08（28/13）
Recommended fuel
Unleaded regular
gasoline
Overall length 700mm Recommended engi ne oil 2-stroke engine oil
Overall width 310mm Recommended gear oi l Hypoid gear oil SAE#90
Overall height (S) 1014mm Gear oil quantity 195 cm3
Overall height (L) 1141mm Spark plug BPR7HS
Weight (S) 20Kg Spark plug gap
0.9～1.0mm
Performance
Items Data Items Data
(4HP) 2.9Kw/5500Rpm Idling speed (in neutral) 1050±50Rpm
(5HP) 3.7Kw/5500Rpm
Spark
plug
25.0Nm
Maximum output
(5.8HP) 4.3Kw6000Rpm
Tightening
torque
for engine
Propeller
nut
17.0Nm
Full throttle
Operating range
4500～5500Rpm
3
1.2.2 Fueling instructions
Fueling instructions:
Recommended gasoline:
Regular unleaded gasoline. If it is not available,
then premium gasoline.
If knocking or pinging occurs, use a different brand of gasoline or premium unleaded fuel. If
leaded gasoline is usually used, engine valves and related parts should be inspected after every
100 hours of operation.
W ARNING:
z Do not smoke when refueling, and keep away from sparks, flames, or other sources of
ignition.
z Stop engine before refueling.
z Refuel in a well-ventilated area. Refuel portable fuel tanks off the boat.
z Do not overfill the fuel tank.
z Take care not to spill gasoline, if gasoline spills, wipe it up immediately.
z Tighten the filler cap securely after refueling.
z If you should swallow some gasoline, inhale a lot of gasoline vapor, or get gasoline in
your eye, get immediate medical attentions.
z If any gasoline spills onto your skin, immediately wash with soap and water. Change
clothing if gasoline spills on it.
z Touch the fuel nozzle to metal components to prevent electrostatic sparks.
4
CAUTION:
Use only new clean gasoline which has been stored in clean containers and is not
contaminated with water or foreign matter.
Engine oil:
Recommended engine oil: 2-stroke outboard motor oil
Gasoline and oil mixing:
25:1
Gasoline 1L 12L 14L 24L
Break-in
period
Engine oil 0.04L 0.48L 0.56L 0.96L
50:1
Gasoline 1L 12L 14L 24L
After
break-in
Engine oil 0.02L 0.24L 0.28L 0.48L
CAUTION:
Be sure to mix gasoline and oil completely, otherwise the engine may be damaged.
1.2.3 Propeller selection
The performance of your outboard motor will be critically affected by your choice of propeller, as
an incorrect choice could adversely affect performance. The outboard motor is fitted with
propellers chosen to perform well over a range of applications, but there may be uses where a
propeller with a different pitch would be more appropriate. PARSUN dealers stock a range of
propellers and can advise you and install a propeller on your outboard that is best suited to your
5
application.
For a greater boat load and a low engine speed, a smaller-pitch propeller is more
suitable. Conversely, a large-pitch propeller is more suitable for a smaller operating load as it
enables the correct engine speed to be maintained.
6
2. Operation
2.1 Installation
Mount the outboard motor on the center line (keel line) of the boat. For boats without a keel or
which are asymmetrical, consult your dealer.
1
1. Center line (keel line)
NOTE:
During water testing check the buoyancy of the boat, at rest, with its maximum load. Check
that the static water level on the exhaust housing is low enough to prevent water entry into
the power head, when water rises due to waves when the outboard is not running.
WARNING:
z Overpowering a boat could cause severe instability. Do not install an outboard motor
with more horsepower than the maximum rating on the capacity plate of the boat. If the
boat does not have a capacity plate, consult the boat manufacturer.
z Improper mounting of the outboard motor could result in hazardous conditions. For
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permanently mounted models, your dealer or other person experienced in proper
rigging should mount the motor. If you are mounting the motor yourself, you should
be trained by an experienced person. For portable models, your dealer or other person
experienced in proper outboard motor mounting should show you how to mount your
motor.
z The information presented in this section is intended as reference only. Proper mounting
depends in part on experience and the specific boat and motor combination.
2.1.1 Mounting height
The mounting height of the outboard motor greatly affects your boat running efficiency. If the
mounting height is too high, cavitation tends to occur, thus reducing the propulsion. If the mounting
height is too low, the water resistance will increase and thereby reduce engine efficiency. Mount
the outboard motor so that the anti-cavitation plate is between the bottom of the boat and a level
25mm below it.
～
8
NOTE:
The optimum mounting height of the outboard motor is affected by the boat and motor
combination and the desired use. Test runs at a different height can help determine the
optimum mounting height. For further information, consult your PARSUN dealer or
boat manufacturer.
2.1.2 Clamping the outboard motor
1. Tighten the transom clamp screw evenly and securely.
Occasionally check the clamp screws for tightness
during operation of the outboard motor because they
could become loose due to engine vibration.
CAUTION:
Outboards that use clamp bracket screws alone
Are INSUFFICIENT to properly and safely secure the
outboard to the Transom. Proper installation of the
outboard includes bolting the engine to the boat through the transom.
WARNING:
z Loose clamp screws could allow the outboard motor to fall off or move on the transom.
This could cause loss of control.
z Make sure the clamp screw s are tightened securely. Occasionally check the screws
for tightness during operation.
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2. If the engine restraint cable attachment is equipped on your engine, an engine restraint cable
or chain should be used. Attach to a secure mounting point on the boat to avoid the engine
being completely lost if it accidentally falls off the transom.
3. Secure the clamp bracket to the transom using the appropriate bolts. For details, consult
your PARSUN dealer.
WARNING:
Avoid using bolts, nuts or washers inappropriate. After tightening, test running the engine
and check their tightness.
2.2 Breaking in engine
Your new engine requires a period of break-in to allow mating surfaces of moving parts to wear in
evenly.
10
Gasoline and oil mixing:
25:1
Gasoline 1L 12L 14L 24L
Break-in period
Engine oil 0.04L 0.48L 0.56L 0.96L
CAUTION:
Failure to follow the break-in procedure could result in reduced engine life or even severe
engine damage.
1. First 10 minutes:
Run the engine at idle.
2. Next 50 minutes:
Run the engine at 3000 r/min or at approximately half throttle.
3. Next 2 hours of operation:
Run the engine at 4000 r/min or at approximately three-quarter throttle.
4. Next 7 hours of operation:
Avoid continuous operation at full throttle for more than five minutes at a time.
5. Operate the engine normally.
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