2004 Bombardier Rally 200 Series Shop Manual, Page 68Get this manual
Section 03 ENGINE Subsection 02 (TROUBLESHOOTING)
ENGINE GENERAL
SYMPTOM CONDITION TestInspection ENGINE BACKFIRESNORMAL USE1Check spark plug andor electrical systemaCarbon accumulation caused by defective spark plugClean carbon accumulation and replace spark plugbElectrical system has failureReplace defective part(s)2Check leakage on intake manifoldaAir leak on intake systemRetighten screws andor replace intake manifold3Check exhaust air leakingaExhaust gasket is leakingRetighten screws andor replace exhaust gasket4Check intake valve(s) for leakingaIntake valve(s) is (are) leakingRepair or replace valve(s)5Check if fuel supply is to less at high RPMaFuel line is contaminated andor bent (engine gets lean)Clean andor replace defective part(s)SYMPTOM CONDITION TestInspection ENGINE SUDDENLY TURNS OFFNORMAL USE1Check condition of spark plug (blue spark ideal)aRed, jumping spark means damaged spark plugReplace spark plug with appropriate heat range (refer to TECHNICAL DATA)2Check fuel supply to engine intakeaRun out of fuelRefillbPoor quality andor wrong fuelClean from contamination and use appropriate fuel (refer to TECHNICAL DATA)cCarburetor contaminatedClean jets and carburetor float chamber from contaminationdFuel line clogged andor bentClean fuel supply from contamination andor replace defective part(s)eFuel supply to less at high RPMClean fuel supply from contamination3Perform engine leak testRefer to ENGINE LEAK TEST procedureCheck for possible piston seizureaDamaged head gasket andor seal andor leaking inletexhaust valve(s)Replace andor repair defective parts