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Troubleshooting
Engine
Lacks
Power
Possible Cause
1.
Raise wheels off the ground
-~-.~
Wheels Do Not Spin Freely - - - - - - . . •
Brake dragging
and spin by hand
•
Worn or damaged wheel bearing
Wheel Splns Freely
T
2.
Check tire pressure - - - - - - - - ;..
~
Pressure Low
- - - - - - - - - - - + - . . .
Faulty tire valve
•
Puncture
Engine Speed Increase
¡.
Pressure Normal
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3.
Accelerate rapidly from low - - -...... Engine Speed Not Changed - - - - - . . . .
Clutch slipping
to second
When Clutch is Released
•
Worn clutch discs/plates
•
Warped c1utch discs/plates
Weak clutch spring
Engine Speed Lowered When
.Clutchis Released
•
4.
Accelerate lightly - - - - - - - . . . . . . Engine Speed Ooes Not - - - - - - - . •
Carburetor choke ON
Increase
•
Clogged air c1eaner
•
Restricted fuel flow
. Clogged muffler
Pinched fuel tan k breather
5.
Check ignition timing - - - - - - 4..
~
Incorrect
---~-------'---'--"'''-'
Faulty COI unit
Faulty pulse generator
Normal
~
Correct
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6.
Test cylinder
compression----4.~Incorrect-------------<.~·
Valve stuck open
•
Worn cylinder andpiston rings
Leaking/Oamaged head gasket
Improper valve timing
7.
Check carburetor for clogging - - - Clogged - - - - - - - - - - - - ' - - - - 1 .. _ .
Carburetor not serviced frequently
enough
Not clogging
t
8.
Remove spark plug
--------;.~
Fouled or Oiscolored
-----~-'---'----.
•
Plug not serviced frequently enough
Spark plug is ineorreet heat range
Oil level too high
Oil level too low
Contaminated oil
Clogged oil passage
Clogged oíl connot orifice
•
•
Not fouled or Oiscolored
•
9.
Check oillevel and conditíon _ _ Incorreet - - - - - - - - ' - - - ' - - - - -___
Correet
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10. Remove cylinder head cavar and __ Valve Train Not Lubricated
-----~
inspeet lubricatlon
Properly
Valve Train Lubricated Properly
j
18-2
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