Section 02 TROUBLESHOOTING
Subsection 01 (TROUBLESHOOTING CHART)
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Defective CPS (
RFI models
) Check operation of CPS and replace if
necessary
Water-contaminated fuel
Check/siphon and refill
Dirty fuel filter
Clean/replace
Fouled or defective spark plug Replace
Water in engine
Check, refer to MAINTENANCE
Carburetion (
carburetor models
) Check, refer to FUEL SYSTEM
Defective ignition circuit
Check, refer to ELECTRICAL SYSTEM
Flooded engine: Carburetor needle
valve stuck open (
carburetor models
)
Check, refer to FUEL SYSTEM
Excessive rotary valve clearance
Check, refer to the appropriate ENGINE
SHOP MANUAL
Incorrect rotary valve timing
Check, refer to the appropriate ENGINE
SHOP MANUAL
Internal engine damage
Check, refer to the appropriate ENGINE
SHOP MANUAL
Defective trigger wheel
(
RFI models
)
Check, refer to MAGNETO SYSTEM in
the appropriate ENGINE SHOP MANUAL
Incorrectly aligned flywheel and rotor
(
RFI models
)
Properly position flywheel and rotor, refer
to MAGNETO SYSTEM in the appropriate
ENGINE SHOP MANUAL
Engine turns over (cont'd)
Insufficient engine compression Replace defective part(s)
Faulty rev limiter in MPEM
(
carburetor models
)
Replace MPEM
Spark plug faulty, fouled or worn out Check spark plug condition
Ignition
Check, refer to ELECTRICAL SYSTEM
No spark at spark plugs
Faulty ECM
(
RFI models
)
Replace ECM
NOTE: Prior to replacing an ECM, refer to the ENGINE MANAGEMENT section and read carefully the
tests to do before replacing an ECM that could otherwise be good.
smr2005-046 27
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