BOMBARDIER SEA-DOO SPX 5838 1998 Shop Manual page 45

ENGINE CONTINUALLY BACKFIRES
OTHER OBSERVATION
Weak spark
Ignition timing
Rotary valve (if applicable)
Carburetor
Engine
ENGINE DETONATION OR PINGING
OTHER OBSERVATION
Ignition
Engine temperature
ENGINE LACKS ACCELERATION OR POWER
OTHER OBSERVATION
Engine revs lower than its
maximum operational RPM
(787 and 947 engines)
Peak performance is delayed
until higher RPM range is
reached (787 and 947
engines)
Subsection 01 (TROUBLESHOOTING CHART)
POSSIBLE CAUSE
• Fouled, defective spark plugs
• Malfunction of rev limiter
• Incorrect setting
• Sheared flywheel key
• Incorrect timing
• Carburetion to lean
• Intake leak/crankshaft seal failure
POSSIBLE CAUSE
• Timing too far advanced
• Spark plug heat range too high
• Defective ignition module or MPEM
• Engine overheats
• Fuel of poor quality
POSSIBLE CAUSE
• Weak spark
• Carburetion, jetting too rich/lean
• Throttle does not open fully
• Low compression
• Exhaust system restriction
• Water in fuel or oil
• Debris in carburetor needle valve
• Impeller leading edge damaged
• Twisted crankshaft
• RAVE valve does not open
• RAVE valve is stuck opened
Section 03 TROUBLESHOOTING
REMEDY
• Clean/replace
• Clean/replace, refer to subsection 08-02
• Check/reset, refer to subsection 08-02
• Check/replace, refer to subsections 08-02
and 04-04
• Check/reset, refer to subsection 04-07
• Check/adjust, refer to subsection 06-04
• Pressure check engine, refer to subsection
04-02
REMEDY
• Check/reset
• Check/change to correct range
• Check/replace, refer to subsection 08-02
• Check, see engine overheats
• Use good quality fuel
REMEDY
• Check/replace, refer to subsection 08-02
• Check/adjust, refer to subsection 06-04
• Check/readjust, refer to subsection 06-04
• Check/repair, refer to subsection 04-05
• Check/clean
• Check/siphon/replace
• Check/clean, refer to subsection 06-04
• Check/replace, refer to subsection 09-02
• Check, refer to subsection 04-06
• Check, refer to subsection 04-05
• Check, refer to subsection 04-05
03-01-3