Engine - BOMBARDIER ski-doo Tundra Scandic 2004 Series Shop Manual

ENGINE

The following chart is provided to help diagnose the probable source of troubles. It should be used as a
guideline. Some causes or corrections may not apply to a specific model.
SYMPTOM ENGINE BACKFIRES.
CONDITION NORMAL USE.
Test/Inspection
Fan-Cooled Engines
Liquid-Cooled Engines
SYMPTOM ENGINE SUDDENLY TURNS OFF AT HIGH RPM AND/OR WITH LIGHT LOAD.
CONDITION NORMAL USE.
Test/Inspection
MMR2004-106_03_02A.FM
1. Check spark plugs.
a. Carbon accumulation caused by defective spark plug(s).
Clean carbon accumulation from piston and cylinder head and install dry properly
gapped spark plug(s).
2. Check ignition timing.
a. Timing is too advanced.
Set timing according to specifications (refer to TECHNICAL DATA).
3. Check carburetor.
a. Fuel passages obstructed.
Clean carburetor and install new filter(s).
b. Fuel level too low.
Adjust float level according to specifications.
4. Check cooling system.
a. Loose fan belt.
Adjust or replace fan belt (refer to AXIAL FAN COOLING SYSTEM).
b. Dirty cooling fins or blocked air ducts.
Clean.
a. Low antifreeze level.
Adjust antifreeze level. Proceed with a leakage test (refer to LIQUID COOLING
SYSTEM) and repair as required.
b. Defective tank cap.
Replace cap.
c. Defective thermostat.
Replace thermostat.
d. Air in system.
Bleed system.
1. Check that all ground wires are well connected.
Section 03 TROUBLESHOOTING
Subsection 02 (ENGINE)
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03-02-1