Bombardier SeaDoo 1990 factory shop manual, Page 190Get this manual
Section 13 TROUBLESHOOTING k-'
ENGINE MISFIRES, RUNS IRREGULARLY
OTHER OBSERVATION
Weak spark
POSSIBLE CAUSE
Check verify heat range replace Check, refer to section 07-05-3 Check, refer to section 07-05-4 Check refill Checklsiphon and refill Checkiclean replace Check clean adjust,refer to section 05-01-1 Checktestreplace, refer to engine section Check replace Check replace Tighten carburetor Check adjust choke cablle Checkcleanreplace Checkcleanadjust, refer to section 05-01 Check, refer to section 05-01 Checkreplace, refer to section
Lean fuel mixture
Fouled, defective, worn spark plugs Faulty RPM limiter Faulty ignition Fuel level low Stale or water fouled fuel Fuel filter dirty or restricted Carburetion dirty or out of adjustment Leaking crankshaft seal, magneto or PTO Fuel valve restricted Fuel tank up screen restricted Loose carburetor, dry spark Partially closed choke Flame arrestor dirty or restricted Carburetor adjustment or setting Main jet loose Main jet O-ring damage