Bombardier SeaDoo 1998 factory shop manual, Page 45Get this manual
Section 03 TROUBLESHOOTING Subsection 01 (TROUBLESHOOTING CHART)
ENGINE CONTINUALLY BACKFIRES
OTHER OBSERVATION
Weak spark Ignition timing
POSSIBLE CAUSE
Fouled, defective spark plugs Malfunction of rev limiter Incorrect setting Sheared flywheel key
Cleanreplace Cleanreplace, refer to subsection 08-02 Checkreset, refer to subsection 08-02 Checkreplace, refer to subsections 08-02 and 04-04 Checkreset, refer to subsection 04-07 Checkadjust, refer to subsection 06-04 Pressure check engine, refer to subsection 04-02
Rotary valve (if applicable) Carburetor Engine
Incorrect timing Carburetion to lean Intake leakcrankshaft seal failure
ENGINE DETONATION OR PINGING
OTHER OBSERVATION
Ignition
POSSIBLE CAUSE