2004 Skidoo ZX Series Service Manual, Page 97Get this manual
Section 03 TROUBLESHOOTING Subsection 04 (ELECTRICAL SYSTEM)
SYMPTOM
FOULED (BLACK) SPARK PLUG TIP
CONDITION
TESTINSPECTION
NORMAL USE 1Check carburetoraCarburetion is too richAdjust according to specifications (refer to TECHNICAL DATA)2Check injection oil consumptionaInjection pump flow is too highAdjust according to specifications or replace3Check oil qualityaPoor quality oil (creation of deposits)Use Bombardier injection oil4Check engine compressionaLeaking piston ring(s)Replace
SYMPTOM