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9-1 SERVICING INFORMATION
TROUBLESHOOTING
ENGINE
Complaint
Engine will not
start,
or i s
hard
to star?.
Engine stalls
easily.
Symptom
and
possible
causer
Carnpre~siom
t o o low.
1. Tappet clearance out of adjustment.
2. Worn valve
guides or poor seating of valves.
3. Valves mistiming.
4. Piston
rings
excessively
worn.
5. Worn-down
cylinder
bores.
6. Starter motor cranks
but too
sFowly.
Plugs not sparking.
1.
Fouled spark plugs.
Remedy
Adjust.
Repair, or replace.
Adjust.
~ e p l a k .
Replace, or rebore.
Consult "electrical
complaints".
Clean.
Adjust.
Replace.
Replace.
Replace.
Clean.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace,
Noisy engine.
I
2. Wet spark
plugs.
3. Defective ignition coil.
4. Open or short in high-tension
cords.
5.
Defective signal generator
o r
igniter unit.
No fuel reaching the carburetors.
1. Clogged hole i n the fuel tank cap.
2. Clogged or defective fuel cock.
3. Defective carburetor needle valve.
4. Clogged fuel pipe or vacuum pipe.
5. Defective fuel cock diaphragm.
1. Fouled spark plugs.
2. Defective signal generator or igniter unit.
3. Clogged fuel pipe.
4. Clogged jets in carburetors.
5.
Tappet
clearance out of adjustment.
Exmsive valve chatter.
T
.
Tappet
clearance too large.
2. Weakened or broken valve springs.
3.
Camshaft iournaf worn and burnt.
Noise
appean
to come from
pistons.
1.
Pistons or cylinders
worn
down.
2. Combustion
chambers
fouled with carbon.
3. Piston pins worn.
Noise
seems
to e r n e
from timing chain.
1. Stretched chain.
2.
Worn sprockets.
3.
Tension adjuster not working.
Noise seems t o toma from clutch.
T
.
Worn splines of countershaft or hub,
2. Worn
teeth
of clutch plates.
3.
Distorted dutch plates, driven and drive.
Noise seems to
come from
crankshaft.
1, Rattling bearings due t o wear.
2.
Big-end bearings worn and
burnt.
3.
Journal bearing worn and burnt.
1 ,
Clean
and dry.
'
Replace.
Replace.
Replace.
Clean.
Clean
o r
replace.
Replace.
Clean.
Replace.
Clean.
Replace.
Clean.
Clean.
Adjust.
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