Service Manual

42
Issue:
Possible Cause:
Solution:
Check:
Engine
Starts But
Runs Rough
or Does Not
Have
Enough
Power
Dirty air filter Check the air filter. Clean or replace as needed
Start the
engine.
Check if it
has power or
runs rough
Choke knob in the
wrong position
Place the choke knob in the correct position.
Air in fuel line or fuel
line clogged
Check the fuel line. Clear or replace as needed.
Not enough fuel to
the engine
Make sure the needle valve is closing properly. Clean
or replace as needed.
Inspect the fuel nozzle. Clean if needed.
Inspect the float. If the float is damaged or sticking,
repair or replace as needed.
Engine idle control
switch on
Turn the engine idle control switch off.
Carbon built up in
combustion chamber
Remove the cylinder head and clean if needed.
Cylinder pressure
Check the valve clearance. Refer to the Maintenance
Specifications chart and the Engine Valve Lash – Adjust
for the proper value. Adjust or repair as needed.
Inspect the cylinder head gasket. Replace if damaged.
Inspect the piston rings. If the piston rings are worn or
broken, replace the piston rings.
If the engine still has
low power:
Rebuild the engine, replace the engine, or consider replacing the unit.
Engine
Shuts Down
Out of fuel Check the fuel level. Fill the tank if necessary.
Start the
engine.
Check if it
shuts down
Not enough oil in the
engine
Check the oil level. If low, add the recommended oil.
Refer to the Engine Oil Level-Check for the proper oil.
Dirty air filter Clean the air filter.
Generator overloaded Unplug some of the devices.
If the engine still
shuts down:
Rebuild the engine, replace the engine, or consider replacing the unit.
Engine
Making
Unusual
Sound
Knocking
Check the engine temperature. If the engine is running
too hot, refer to the section on overheating.
Start the
engine.
Check for
unusual
sound
Make sure the fuel is good and the proper rating. Drain
and refill
the fuel tank
if necessary
.
Make sure the flywheel is properly tightened to the
crankshaft. Refer to Flywheel – Install for the proper
torque.
Check the valve clearance. Refer to the Maintenance
Specifications chart and the Engine Valve Lash – Adjust
for the proper value. Adjust or repair as needed.
Check for carbon deposits in the cylinder. Clean if
needed.
Inspect the piston and piston rings. If the piston or rings
are worn or broken, replace the defective part.
Inspect the piston pin and piston pin hole. Replace if
worn.
Inspect the connecting rod ends. Replace if worn.
Inspect the main bearing. Replace if worn.
If the engine still
makes an unusual
sound:
Rebuild the engine, replace the engine, or consider replacing the unit