Technical data

03-00-2
Section 03 TROUBLESHOOTING
ENGINE MISFIRES, RUNS IRREGULARLY
ENGINE OVERHEATS
ENGINE CONTINUALLY BACKFIRES
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Weak spark • Fouled, defective, worn spark plugs
• Faulty rev limiter or ignition
• Sheared flywheel key
• Check / verify heat range / gap / replace
• Check, refer to section 08-02
• Check timing mark, refer to section 08-02
Lean fuel mixture
Dry spark plug (except when
water fouled)
• Low fuel level
• Stale or water fouled fuel
• Fuel filter dirty or restricted
• Carburetion dirty or out of adjustment
• Leaking crankshaft seal(s), intake or rotary
valve cover
• Restricted fuel valve
• Loose carburetor
• Check / refill
• Check / siphon and refill
• Check / clean / replace
• Check / clean / adjust, refer to section
06-03
• Check / test / replace, refer to engine sec-
tion 04-03 and 04-04
• Check / replace
• Tighten carburetor(s)
Rich fuel mixture
Fouled spark plug
• Partially closed choke
• Flame arrester dirty or restricted
• Carburetor adjustment or setting
• Loose main jet
• Rotary valve shaft seal leaking
• Oil pump adjustment
• Worn needle(s) and seal(s)
• Excessive rotary valve clearance
• Check / adjust choke cable
• Check / clean / replace
• Check / clean / adjust, refer to section 06-03
• Check, refer to section 06-03
• Check / replace, refer to section 04-04
• Check / adjust, refer to section 07-02
• Check, refer to section 06-03
• Check, refer to section 04-04
Difficult to start • Incorrect rotary valve timing
• Excessive rotary valve clearance
• Check / adjust, refer to section 04-04
• Check, refer to section 04-04
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Monitoring beeper sounds
continuously
• Restricted jet pump water intake
• Cooling system restriction
• Grounded temperature sensor or sensor
wire
• Check / clean
• Check / flush, refer to section 02-02
• Check / repair / replace
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Weak spark • Fouled, defective spark plugs
• Malfunction of rev limiter
• Clean / replace
• Clean / replace, refer to section 08-02
Ignition timing • Incorrect setting
• Sheared flywheel key
• Check / reset, refer to section 08-02
• Check / replace, refer to section 08-02
Rotary valve • Incorrect timing • Check / reset, refer to section 04-04
Carburetor • Carburetion to lean • Check / adjust, refer to section 06-03
Engine • Intake leak / crankshaft seal failure • Pressure check engine to 48 kPa (7 PSI)
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