Ski-Doo MACH Z 1997 Shop Manual page 48

Section 02 TROUBLESHOOTING
Sub-Section 05 (ELECTRICAL SYSTEM)
CONDITION
Test/Inspection
SYMPTOM
CONDITION
Test/Inspection
SYMPTOM
CONDITION
Test/Inspection
02-05-8
RIDING IN DEEP AND THICK SNOW
1. Perform all verifications outlined under "Engine does not start — no spark at
spark plug".
2. Verify spark plug(s). Proceed with spark plug analysis in order to identify
source of problem.
a.Defective and/or worn spark plug(s) and/or cable(s) and/or cap(s).
Replace defective part(s). Proceed with ignition system testing procedures.
Perform engine analysis.
FOULED (BLACK) SPARK PLUG TIP
NORMAL USE
1. Check carburetor(s).
a.Carburetion is too rich.
Adjust according to specifications (refer to TECHNICAL DATA 09).
2. Check injection oil consumption.
a.Injection pump flow is too high.
Adjust according to specification or replace.
3. Check oil quality.
a.Poor oil quality that creates deposits.
Use Bombardier oil.
4. Check engine compression.
a.Leaking piston ring(s).
Replace.
SPARK PLUG TIP(S) IS (ARE) LIGHT GREY
NORMAL USE
1. Refer to "Engine slows down or stops at high RPM" and check items listed.
2. Check spark plug heat range.
a.Spark plug heat range is too high.
Replace by Bombardier's recommended spark plug (refer to TECHNICAL DATA 09).
3. Check if air intake silencer leaks.
a.Air surplus coming from opening(s) located between halves.
Seal.
4. Check carburetor adapter collars.
a.Loose collar(s).
Tighten.
5. Check carburetor adapter(s).
a.Cracked or deformed adapter(s).
Replace.