8-1
SERVICING
INFORMATION
TROUBLESHOOTING
ENGINE
Complaint
Symptom
and possible causes
Engine will
not
Compression
too
low
start,
or
is
hard
1.
Excessively worn cylinder
or
piston rings.
to
start.
2. Stiff piston ring
in
place.
3.
Gas leaks from
the
joint
in
crankcase, cylinder
or
cylinder head.
4. Spark plug
too
loose.
5. Broken, cracked
or
otherwise failed piston.
6. Worn crankshaft oil seal.
Plug
not
sparking
1. Fouled spark plug.
2. Wet spark plug.
3. Defective ignition coil.
4. Open or short
in
high-tension cord.
5.
Defective COl unit.
No
fuel reaching
the
carburetor
1. Clogged air vent hole
in
the
fuel
tank
cap.
2. Clogged
or
defective fuel cock.
3.
Defective carburetor needle valve.
4. Clogged fuel pipe.
Engine stalls
1. Fouled spark plug.
easily.
2. Defective COl unit.
3. Clogged fuel pipe.
4. Clogged jets
in
carburetor.
Noisy engine
Noise appears
to
come from piston
1. Piston
or
cylinder worn down.
2. Combustion chamber fouled with carbon.
3. Piston pin
or
piston pin bore worn.
4. Piston ring groove worn.
5. Piston pin bearing worn.
Noise seems
to
come from clutch
1. Worn splines
of
countershaft
or
hub.
2. Worn
teeth
of
clutch plates.
3. Distorted clutch plates, driven and drive.
Noise seems
to
come
from crankshaft
1. Rattling bearings due
to
wear.
2. Big-end bearings worn and burnt.
3. Crankshaft bearing worn and burnt.
Noise seems
to
come from transmission
1.
Gears worn
or
rubbing.
2.
Badly worn splines.
3.
Primary gears worn
or
rubbing.
Slipping clutch
1.
Clutch control
out
of
adjustment
or
loss
of
play.
2. Weakened clutch springs.
3. Worn
or
distorted pressure plate.
4. Distorted clutch plates, driven and drive.
Remedy
Replace.
Repair
or
replace.
Repair
or
replace.
Tighten.
Replace.
Replace.
Clean.
Clean and dry.
Replace.
Replace.
Replace_
Clean.
Clean
or
replace.
Replace.
Clean.
Clean.
Replace.
Replace.
Clean.
Replace.
Clean.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Replace.
Replace.
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