BOMBARDIER RALLY 200 2003 Shop Manual page 73

SYMPTOM ENGINE SUDDENLY TURNS OFF.
CONDITION NORMAL USE.
Test/Inspection
VMR2003_006_03_02A.FM
1. Check condition of spark plug (blue spark ideal).
a. Red, jumping spark means a damaged spark plug.
Replace spark plug with appropriate heat range (refer to TECHNICAL DATA).
2. Check fuel supply to engine intake.
a. Run out of fuel.
Refill.
b. Poor quality and/or wrong fuel.
Clean from contamination and use appropriate fuel (refer to TECHNICAL DATA).
c. Carburetor contaminated.
Clean jets and carburetor float chamber from contamination.
d. Fuel line clogged and/or bent.
Clean fuel supply from contamination and/or replace defective part(s).
e. Fuel supply to less at high RPM.
Clean fuel supply from contamination.
3. Perform engine leak test. Refer to ENGINE LEAK TEST procedure. Check for
possible piston seizure.
a. Damaged head gasket and/or seal and/or leaking inlet/exhaust valve(s).
Replace and/or repair defective parts.
4. Piston seizure.
a. Spark plug heat range is too low.
Install spark plug with appropriate heat range (refer to TECHNICAL DATA).
b. Compression ratio is too high.
Install genuine parts.
c. Poor oil quality.
Use a high quality oil.
d. Leaks at air intake manifold (engine gets too lean).
Retighten screws or replace air intake manifold.
5. Melted and/or perforated piston dome; melted section at ring end gap.
a. Spark plug heat range is too low.
Install recommended spark plug (refer to TECHNICAL DATA).
b. Coolant less than recommended level (engine gets too hot).
Repair cooling circuit and/or refill with recommended liquid.
Section 03 ENGINE
Subsection 02 (TROUBLESHOOTING)
03-02-13