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TROUBLESHOOTING
POSSIBLE CAUSE
1
1 . Remove
cylinder head
cover and
inspect
lubrication
VALVE TRAIN
NOT
LUBRICATED
PROPERLY
Clogged oil passage
Clogged oil control orifice
Contaminated oil
Faulty oil pump
VALVE TRAIN LUBRICATED
PROPERLY
I
12. Check for engine overheating
OVERHEATING
Coolant level low
Fan
motor not
working
(Faulty fan motor
switch)
Thermostat stuck closed
Excessive carbon
build-up in com¬
bustion chamber
Use of
poor
quality fuel
Clutch slipping
Lean fuel mixture
NOT OVERHEATING
#
13. Accelerate
or run
at
high
speed
ENGINE KNOCKS
Worn
piston and cylinder
Wrong
type
of fuel
Excessive carbon build-up
in com¬
bustion chamber
Ignition timing
too
advanced
(Faulty spark
unit)
Lean fuel mixture
ENGINE DOES NOT KNOCK
POOR PERFORMANCE AT LOW AND IDLE SPEEDS
POSSIBLE CAUSE
t
Check
ignition timing
and valve
clearance
1.
INCORRECT
Improper valve clearance
Improper ignition timing
—
Faulty spark unit
—
Faulty pulse generator
CORRECT
I
Check
carburetor pilot
screw
adjustment
2.
INCORRECT
See Fuel System
(Section 8)
of the
Common Service Manual
CORRECT
I
3. Check for leaking intake
pipe
LEAKING
Loose carburetor
Damaged insulator
NO LEAKAGE
I
4. Perform
the spark
test
WEAK OR INTERMITTENT SPARK
Faulty, carbon or
wet
fouled
spark
plug
Faulty following (page
15-3):
—
ignition coil
—
pulse
generator
— neutral switch
—
spark unit
— side
stand switch
—
engine
stop
switch
I
GOOD SPARK
19-3
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