BOMBARDIER ski-doo Tundra Scandic 2004 Series, Shop Manual

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Section 03 TROUBLESHOOTING
Subsection 02 (ENGINE)
03-02-2
MMR2004-106_03_02A.FM
SYMPTOM ENGINE SUDDENLY TURNS OFF.
CONDITION NORMAL USE.
Test/Inspection 1. Perform engine leak test. Refer to ENGINE LEAK VERIFICATION FLOW CHART.
Check possible piston seizure.
a. Damaged gasket and/or seal.
Replace defective parts.
2. “Four-corner” seizure of piston(s).
a. High acceleration when engine is cold. Piston expands faster than cylinder.
Replace piston(s). Ask driver to refer to the warm-up procedure in the Operator’s
Guide .
3. Piston(s) seizure on exhaust side (color on piston dome is correct).
a. Kinked fuel tank vent tube.
Relocate fuel tank vent tube.
b. Leaks at fuel line connections or damaged fuel lines.
Replace defective lines.
c. Fuel does not flow through carburetor(s) (foreign particles in needle area and/or
varnish formation in carburetor(s)).
Clean carburetor(s) and install new filter(s).
d. Spark plug heat range is too warm.
Install spark plugs with appropriate heat range (refer to TECHNICAL DATA).
e. Improper ignition timing.
Adjust according to specifications (refer to TECHNICAL DATA).
f. Restriction in exhaust system.
Replace.
g. Compression ratio is too high.
Install genuine parts.
h. Carburetor calibration is too lean.
Adjust according to specifications (refer to TECHNICAL DATA).
i. Improper reed valve adjustment or damage.
Adjust according to specifications (refer to appropriate ENGINES TYPES) and/or
install Bombardier’s recommended reed valve.
j. Poor quality oil.
Use BOMBARDIER injection oil.
k. Leaks at air intake silencer.
Replace air intake silencer grommets.