3. TROUBLESHOOTING
16
3-1-2 Power Lack
TROUBLE CAUSE
REMEDY
When in
creasi
ng thro
tt
le,
sp
ee
d i
ncre
ase
slow
or e
ve
n
decrease an
d
st
op
run
ni
ng
Ignit
io
n s
yste
m
Fuel s
upply system
Air in fuel line or fuel line clogged
Exhaust air or dredge fuel line
Main oil flow hole is not adjusted properly
Readjust
In carburetor, needle valve hole and main
oil flow hole clogged.
Clean and blow to get through
Fuel cock is clogged up.
Clean, replace damaged part
Too much carbon deposit in combusting
chamber.
Clear away
Air cleaner is clogged up.
Clean air cleaner filter element
Poor com
pres
sion
Piston or cylinder or piston ring is worn
Replace the worn
Air leakage from the surface by which
cylinder block contacting with cylinder
head.
Replace cylinder gasket
Too big or too small valve clearance.
Readjust
Valve tightness is poor.
Repair
Compression pressure check
Drain the oil of the fuel tank out.
Drain the gasoline by loosening the oil drain bolt
of the carburetor.
Remove the spark plug cap and spark plug and
install the cylinder pressure meter.
Forcibly pull the recoil starter several times and
measure compression force.
