2001 Ski-Doo Mini Z Factory Shop Manual, Page 40Get this manual
Section 03 TROUBLESHOOTING Subsection 02 (ENGINE)
SYMPTOM CONDITION TestInspection ENGINE BACKFIRESNORMAL USE1Check spark plugaCarbon accumulation caused by defective spark plugClean carbon accumulation and replace spark plug2Check ignition timingaTiming is fixed but ensure that woodruff key holding flywheel is in placeSYMPTOM CONDITION TestInspection ENGINE DOES NOT OFFER MAXIMUM POWER ANDOR DOES NOT REACH MAXIMUM OPERATING RPMNORMAL USE1Check spark plug conditionaFouled spark plug(s)Replace2Check if there is water in fuelaThere is water in fuelDrain fuel system, then fill it with appropriate fuel3Check governor adjustmentaGovernor out of adjustmentReadjust4Check carburetor adjustments and cleanlinessaInadequate carburetor adjustments or dirt accumulationAdjust according to specifications (refer to TECHNICAL DATA 10) or clean5Check valve clearanceaValve clearance incorrectReadjust6Check valve conditionaValve or valve seat worn or damagedInspect and correct7Check track adjustment