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TROUBLESHOOTING
21-4
7.
Cylinder compression
Inspection
Test
the cylinder compression.
Is
the compression
low?
YES
_
.
Valve clearance too small
•
Valve stuck open
•
Worn
cylinder and
piston rings
•
Damaged
cylinder
head
gasket
•
Improper
valve timing
•
Faulty decompressor
cam
NO
-
GO
TO STEP
8.
8.
Carburetor
Inspection
Check
carburetor
for
clogs.
Is
the
carburetor
for clogged?
YES
_
.
Carburetor not serviced
frequently
enough
•
Carburetor dirty
•
Dirt getting
past
air
cleaner
NO
- GO
TO
STEP 9.
9.
Spark
Plug
Inspection
Remove
and
inspect
spark plug.
Is the
spark
plug
fouled
or
discolored?
NO
-
.
Plug
not
serviced
frequently
enough
•
Incorrect spark plug heat
range
•
Incorrect spark plug
gap
YES
- GO
TO STEP
10.
10.
Engine
Oil
Inspection
Check oil level and condition.
Is
there correct
level
and
good
condition?
NO
_
.
Oil level too
high
•
Oil
level
too low
•
Contaminated oi
l
YES
- GO
TO STEP 11.
11.
Over
Heating
Inspection
Check
engine overheating.
Is
the engine overheating?
YES
_
.
Coolant
level too low
•
Excessive
carbon
build-up
in combustion chamber
•
Use
of poor quality
fuse
•
Clutch slipping
NO
- GO
TO STEP 12.
12.
lubrication Inspection
Remove cylinder
head cover
and inspect lubrication.
Is
the valve train
lubricated
properly?
NO
_.
Faulty
oil
pump
•
Faulty
pressure
relief
valve
•
Clogged oil passage
•
Clogged oil strainer
YES
- Valve train lubrication is
normal
1
I
I
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Table of Contents
Troubleshooting
