Section 02 TROUBLESHOOTING
Sub-Section 01 (TROUBLESHOOTING CHART)
02-01-2
ENGINE MISFIRES, RUNS IRREGULARLY
ENGINE OVERHEATS
ENGINE CONTINUALLY BACKFIRES
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Weak spark • Fouled, defective, worn spark plugs • Check/verify heat range/gap/replace
• Faulty rev limiter or ignition module • Check, refer to section 07-02
• Sheared flywheel key • Check timing mark, refer to section 07-02
Lean fuel mixture
Dry spark plug (except when
water fouled)
• Low fuel level • Check/refill
• Stale or water fouled fuel • Check/siphon and refill
• Fuel filter dirty or restricted • Check/clean/replace
• Carburetion dirty or out of adjustment • Check/clean/adjust, refer to section 05-04
• Leaking crankshaft seal(s), intake or rotary
valve cover O-ring
• Pressure check engine, refer to 03-02
• Restricted fuel valve • Check/replace
• Loose carburetor • Tighten carburetor(s)
Rich fuel mixture
Fouled spark plug
• Partially closed choke • Check/adjust choke cable
• Flame arrester dirty or restricted • Check/clean/replace
• Carburetor adjustment or setting • Check/clean/adjust, refer to section 05-04
• Loose main jet (if applicable) • Check, refer to section 05-04
• Rotary valve shaft seal leaking • Check/replace, refer to section 03-07
• Oil pump adjustment • Check/adjust, refer to section 06-03
• Worn needle(s) and seal(s) • Check, refer to section 05-04
• Excessive rotary valve clearance • Check, refer to section 03-07
Difficult to start • Incorrect rotary valve timing • Check/adjust, refer to section 03-07
• Excessive rotary valve clearance • Check, refer to section 03-07
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Monitoring beeper sounds
continuously
• Restricted jet pump water intake • Check/clean
• Cooling system restriction • Check/flush, refer to section 01-03
• Grounded temperature sensor or sensor
wire
• Check/repair/replace
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Weak spark • Fouled, defective spark plugs • Clean/replace
• Malfunction of rev limiter • Clean/replace, refer to section 07-02
Ignition timing • Incorrect setting • Check/reset, refer to section 07-02
• Sheared flywheel key • Check/replace, refer to section 07-02
and 03-04
Rotary valve • Incorrect timing • Check/reset, refer to section 03-07
Carburetor • Carburetion to lean • Check/adjust, refer to section 05-04
Engine • Intake leak/crankshaft seal failure • Pressure check engine, refer to 03-02
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