1996 Ski-Doo Shop Manual, Volume 1, Page 65Get this manual
Se ion ROU BLESH OOT Sub-Section 04 (ELECTRICAL SYSTEM)
SYMPTOM CONDITION TestInspection
FOULED (BLACK) SPARK PLUG TIPNORMAL USE1) Check carburetor(s)a) Carburetion is too richAdjust according to specifications (refer to technical data 10)2) Check injection oil consumptiona) Injection pump flow is too highAdjust according to specification or replace3) Check oil qualitya) Poor oil quality that creates depositsUse Bombardier oil4) Check engine compressiona) Leaking piston ring(s)Replace
SYMPTOM CONDITION TestInspection