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18. Troubleshooting
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Engine Does Not Start or is Hard to Start
Engine Lacks Power
18-1
18-2
Poor Performance at High Speed
Poor Handling
18-4
18-4
Poor Performance at Low and Idle Speeds 18-3
L
Engine Does Not
Start
or is Hard to
Start
Possible Cause
Reaching Carburetor
!
1. Check the fuel flow to carburetor - - - Not Reaching Carburetor
- - - - - - - i..
~.
Clogged fueltube or fuel strainer
screen
•
Sticking float valve
•
Clogged fuel tank breather
Good 8park
2. Perform a spark test - - - - - - - + - . . Weak or No S p a r k - - - - - - - - - + - .. •
Faulty spark plug
Fouled .spark plug
•
Faulty CDI unít
•
Broken or shorted spark plug wire
•
Broken or shorted ignition coil
•
Faulty ignitíon switch
•
Faultv pulse generator
Faultv
exciter coil
F.aulty engine stop switch
Loose or disconnected ignition
system wires
Compression Normal
3. Test cylinder compression
----~
.. Low Compression - - ' - - - - - - - - - " •
Valve stuck open
•
Worn cylinder and piston ring
•
Leaking/damaged eylinder head
gasket
Seized valve
Improper valve timing
Engine Does Not Fire
J
5. Remove andinspect spark plug--- Wet Plug
----'----'------~..
•
Floodedcarburetor
Choke closed
•
Throttle
val~e
open
Air cleaner dirtv
'f
4. Start by following
normal-----1"~
Engine Starts But Stops
-~~----i"~
Improper choke operation
procedure
•
Carburetor incorrectly adjusted
Intake pipe leaking
Improperignition timing (Faulty
ignition coil or pulsegenerator)
Fuefcontaminated
18-1
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