BOMBARDIER ski-doo Tundra Scandic 2004 Series, Shop Manual

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Section 03 TROUBLESHOOTING
Subsection 02 (ENGINE)
MMR2004-106_03_02A.FM
03-02-7
SYMPTOM IRREGULAR ENGINE IDLE.
CONDITION NORMAL USE AFTER ENGINE WARM UP.
Test/Inspection 1. Check choke.
a. Choke plunger may be partially opened.
Readjust.
2. Check carburetor adapter.
a. Air enters through a crack.
Replace.
3. Check air screw position.
a. Inadequate fuel/air mixture.
Adjust according to specifications (refer to TECHNICAL DATA).
4. Check dimension of pilot jet.
a. Inadequate fuel/air mixture.
Adjust according to specifications (refer to TECHNICAL DATA).
5. Check reed valve.
a. Improper tightness and/or opening.
Replace or adjust. Refer to proper ENGINE subsection.
6. Perform engine leak test.
a. Leaking gaskets allow air to enter in engine.
Replace defective parts.
7. DPM manifold air vent is obstructed.
a. Carburetion is too lean.
Ensure proper air vent.
8. Check ignition system trigger coil air gap.
a. Air gap is too large.
Adjust according to specifications (refer to TECHNNICAL DATA).