Sea-doo RX Shop Manual page 53

ENGINE CONTINUALLY BACKFIRES
OTHER OBSERVATION
Weak spark
Spark plugs
Ignition timing/TDC setting
Carburetor
(if so equipped)
Engine
ENGINE DETONATION OR PINGING
OTHER OBSERVATION
Ignition
Engine temperature
SMR2000-042-03-01.FM
Subsection 01 (TROUBLESHOOTING CHART)
POSSIBLE CAUSE
• Fouled, defective spark plugs
(carburetor models)
• Malfunction of rev limiter in MPEM
(carburetor models)
• Spark plug leads or wiring reversed
• Incorrect setting
• Sheared flywheel key
• Carburetion too lean
• Intake leak/crankshaft seal failure
(carburetor models)
POSSIBLE CAUSE
• Timing too far advanced
• Spark plug heat range too high
• Defective MPEM (carburetor models) • Check/replace, refer to section ELEC-
• Engine overheats
• Fuel octane too low of poor quality
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Section 03 TROUBLESHOOTING
REMEDY
• Clean/replace
• Clean/replace, refer to section ELEC-
TRICAL SYSTEM
• Check with wiring diagram
• Check/reset, refer to section ELECTRI-
CAL SYSTEM
• Check/replace, refer to sections ELEC-
TRICAL SYSTEM and ENGINE
• Check/adjust, refer to section FUEL
SYSTEM
• Pressure check engine, refer to section
ENGINE
REMEDY
• Check/reset
• Check/change to correct range
TRICAL SYSTEM
• Check, see engine overheats
• Use good quality fuel
03-01-5