Zenoah G320PUM Owner's Manual

OWNER'S MANUAL

115767226 (508)

Model: G320PUM for radio control Boat
Model code: 967289101

WARNING

•This engine is designed for radio controlled boat use.

•When replacing parts, use only parts which have been certified by
Zenoah.

• Zenoah assumes that no responsibility for this engine that is modified
or used for any other applications.

• Purchaser has all responsibilities against any laws and regulations
existing in the country, Zenoah is exempt from such laws and
regulations.

• Read and completely understand this OWNER'S MANUAL before
operating this engine.

2

3

Safety Precautions ....................................................4

Engine Assembling....................................................5

Engine Mounting........................................................6

Screw Propeller and Exhaust System .......................7

Fueling System..........................................................8

Starting ......................................................................9

How to Stop The Engine............................................9

Carburetor Adjustment ............................................10

Engine Break-In.......................................................12

Operation.................................................................12

Maintenance............................................................13

Special Tools...........................................................18

Service Guide..........................................................19

Trouble Shooting .....................................................22

Parts List..................................................................24

Warranty..................................................................27

Contents

4

Safety Precautions

• This manual describes the engine. For its mounting and control, see the
instruction manual provided by model boat manufacturer.

• This engine is designed for model boat use. If it is used for any other purpose,
we cannot be responsible for its reliability, safety and any laws/regulations in
the country.

• Use genuine parts for replacement.

• Check the rotor and screw-propeller every time. If it is damaged, replace it
with a new one.

• If the screw-propeller hit something while the engine is in operation,
immediately stop the engine and check it.

•Start the engine on a flat surface without pebble stones.

•Never modify the rotor.

• Check the rotor. If it is damaged, replace it with a new one.

• When mixing the fuel, or operating the engine, carry it out in a well-ventilated
place.

• The fuel is toxic. Do not let it get into your eyes or mouth. Store it in a cool
place, out of the reach of infants and children.

• To prevent electrification, never touch the high-tension wire of the spark plug
during operation.

• The engine metal parts can burn your skin. Never touch the engine and
muffler during operation or right after stopping the engine.

• Please wear clothing that facilitates your safety. Remove all scarves, overly
long sleeves, neckties and like. Failure to do so could result in injury.

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2

3

4

6

5

7

1

The carburetor and air-funnel are not assembled at factory.
Make sure that the assembling for such parts are done according to the Fig.1.

Make sure that gasket and carburetor are mounted as described in fig.1.
The engine does not start if carburetor is mounted upside down position.

CAUTION

Engine Assembling

1. Engine

2. Gasket (1140-13141)

3. Gasket (T2075-14120)

4. Carburetor SET (585879701)

5. Air-funnel (848ES08300)

6. Spacer (1142-83110)

7. Bolt (8488455000)

Fig.1

G320PUM

6

Engine Mounting

Make sure that the engine is to be mounted according to the instruction manual
provided by model boat manufacturer.
In case such instruction manual is not available, make sure that the engine should
be mounted at least by 4 points both at engine's PTO side and recoil starter side.

[ Note ]

1) Be sure to set flat washers or metal plates on the reverse side of the
mount to prevent bolts from sinking into the mount.
Be sure to check if the bolts are securely fastened.

2) The fuel head between carburetor and the bottom of fuel tank must be less
than 100 mm (4 inches)

7

The exhaust system (e.g., muffler) is not equipped with this engine as standard.
When you select the exhaust system, check the engine speed (rpm) when the
maximum output is generated by using the exhaust system you are going to select.
And then decide the appropriate screw-propeller that would meet such engine
speed (rpm) that the exhaust system requires.
In general, contact your boat manufacture to select appropriate screw-propeller and
exhaust system.

Screw-Propeller and Exhaust System

8

• Mix gasoline (octane over 95) and high grade 2 cycle engine oil (mixing use
type; JASO FC grade or ISO-L-EGC grade) at mixing ratio 25:1.

• The mixing ratio is according to the oil recommendation.

[ NOTE ]

1) Gasoline may contain maximum of 10% Ethanol (grain alcohol) or up to 15%
MTBE (Methyl tertiary-butyl ether).
Gasoline containing Methanol (Wood Alcohol) is NOT approved.

2) Gasoline is very flammable. Avoid smoking and any fires near fuel.

3) To prevent all possible problems on fueling system, make sure to use the fuel
filter which has more than 300 mesh or equivalent and gasoline proof rubber
pipe or equivalent.
Incorrect fuel filter may cause engine trouble like fuel passage stuffing in
carburetor, or piston surface scratching etc.

4) When fueling, make sure that no fuel touches the hot parts.

5) Assemble the fuel line so that it does not touch the hot parts. Also, check that
there is no fuel leakage due to cracks, or hardening.

Fueling System

9

How to Stop The Engine

● How to start
a. Fill the fuel tank with the fuel.
b. Push the priming bulb upper the carburetor until fuel appears in the priming bulb.
c. Choke the engine and open the throttle valve approximately 1/4~1/3 of the full

open position.
d. Quickly pull the starter cord until the initial combustion noise is heard.
e. When the initial combustion noise is heard, open the choke, set the throttle valve

at the idle position or at the position slightly open from the idle position and

quickly pull the starter cord a few more times. Then the engine starts.

Starting

For stopping the engine, the red lead wire
from the coil should be grounded to the
engine body, or the throttle valve should be
closed completely.

Red
Lead

Black
Lead

Kill Switch