Section 02 TROUBLESHOOTING
Sub-Section 01 (TROUBLESHOOTING CHART)
02-01-3
ENGINE DETONATION OR PINGING
ENGINE LACKS ACCELERATION OR POWER
ENGINE RUNS TOO FAST
ABNORMAL NOISE FROM PROPULSION SYSTEM
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Ignition • Timing too far advanced • Check/reset
• Spark plug heat range too high • Check/change to correct range
• Defective ignition module • Check/replace, refer to section 07-02
Engine temperature • Engine overheats • Check, refer to engine overheats
• Fuel of poor quality • Use good quality fuel
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
• Weak spark • Check/replace, refer to section 07-02
• Carburetion, jetting too rich/lean • Check/adjust, refer to section 05-04
• Throttle does not open fully • Check/readjust, refer to section 05-04
• Low compression • Check/repair, refer to section 03-05
• Exhaust system restriction • Check/clean
• Water in fuel or oil • Check/siphon/replace
• Debris in carburetor needle valve • Check/clean, refer to section 05-04
• Impeller leading edge damaged • Check/replace, refer to section 08-02
• Twisted crankshaft • Check, refer to section 03-06
Engine revs lower than its
maximum operational RPM
(787 engine)
• RAVE valve does not open • Check, refer to section 03-05
Peak performance is delayed
until higher RPM range is
reached (787 engine)
• RAVE valve is stuck opened • Check, refer to section 03-05
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
Engine RPM too high • Faulty rev limiter • Check, refer to section 07-02
• Improper impeller pitch (too low) • Check/replace, refer to section 08-02
Jet pump cavitation • Damaged leading or trailing edge of
impeller
• Check/replace
NOTE: Leading edge damage contributes to
poor performance from start. Trailing edge
damage contributes to poor top performance
and stator vanes erosion.
• Sealing of ride shoe or jet pump sup-
port/jet pump
• Check/reseal, refer to section 08-02
or 11-02
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
• Weeds/debris caught in intake grate or
impeller
• Check/clean
• Low oil level in pump housing • Check/troubleshoot source of leak/refill
supply, refer to section 08-02
• Worn anti-knocking system • Check/replace pusher in cover, refer to
section 08-02
• Damaged or bent drive shaft • Check/replace, refer to section 08-03
• Broken motor mounts • Check/replace, refer to section 03-03
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