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CYLINDER HEADNALVES
TROUBLESHOOTING
Engine top-end
problems
are usually
performance-related
and can usually
be
diagnosed by a compression test.
Engine
noises can usually be traced to the top-end
with
a
sounding
rod
or stethoscope.
low Compression
•
Valve
I
ncorrect
valve adjustment
Burned
or
bent
valves
Incorrect valve timing
Broken
valve
spring
•
Cy
l
inder
head
-
Leaking
or
damaged head gasket
-
Warped or cracked cylinder head
•
Cylinder
and piston (Refer to Section 7)
.
•
Decompressor out
of
adjustment
High
Compression
•
Excessive
carbon
build-up on piston crown
or combustion chamber
EKcessive Noise
•
Incorrect valve adjustment
•
Sticking
valve
or
broken
valve
spring
•
Damaged or worn rocker arm or camshaft
•
Loose
or worn cam chain
•
Worn or damaged cam chain tensioner
•
Worn
cam
sprocket
teeth
•
Faulty
cam
chain
tensioner
Poor
Idling
•
Compression too low
•
Decompressor
out
of
adjustment
Hard
Kick Starting
•
Decompressor out
of
adjustment
6-3
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