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4-1-2 Power lack
TROUBLE
Ignition
system
Fuel supply
system
When increas-
ing throttle,
speed increase
slow or even
decrease and
stop running
Poor
compres-
sion
Pressure meter
CAUSE
Air in fuel line or fuel line
clogged.
Main oil flow hole is not adjust-
ed properly.
In carburetor, needle valve hole
and main oil flow hole clogged.
Fuel cock is clogged up.
Too much carbon fouling in
muffler and exhaust pipe.
Too much carbon deposit in
combusting chamber.
Air cleaner is clogged up.
Intake pipe is leaking.
Intake pipe is leaking.
Piston or cylinder or piston ring
is worn.
Air leakage from the surface by
which cylinder block contacting
with cylinder head.
Too big or too small valve
clearance.
Cylinder pressure check
9 Drain the gasoline in the fuel tank out.
9 Drain the gasoline by loosening the oil drain
9 Remove the spark plug cap and spark plug
9 Forcibly pull the recoil starter several times
22
4-1 Troubleshooting
Exhaust air or dredge fuel line.
Readjust.
Clean and blow to get through.
Clean, replace damaged part.
Clear away.
Clear away.
Clean air cleaner filter element.
Repair or replace.
Repair or replace.
Replace the worn.
Replace cylinder gasket.
Readjust.
bolt of the carburetor.
and install the cylinder pressure meter.
and measure compression force.
Cylinder pressure:
1.38 Mpa at 1200 rpm
REMEDY
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