BOMBARDIER 650 Operator's Manual page 132

6. Engine compression.
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As the engine is pulled over with the starter or with the rewind starter,
"cycles" of resistance should be felt as piston goes past top dead center.
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If no pulsating resistance is felt, it suggests a major loss of compression
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Contact an authorized Bombardier ATV dealer.
Engine lacks acceleration or power
1. Fouled or damaged spark plug(s).
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Check item ENGINE TURNS OVER BUT FAILS TO START.
2. Lack of fuel to engine.
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Check item ENGINE TURNS OVER BUT FAILS TO START.
3. Carburetor adjustments.
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Contact an authorized Bombardier ATV dealer.
4. Engine is overheating.
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Check ENGINE OVERHEAT in SPECIAL PROCEDURES.
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If overheating persists, contact an authorized Bombardier ATV dealer.
5. Air filter box plugged or dirty.
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Check air filter and clean if necessary.
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Check deposits in air box drain
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Check the position of the air intake tube, reinstall properly if necessary
6. CVT dirty or wear.
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Contact an authorized Bombardier ATV dealer.
Engine backfire
1. Exhaust system leakage.
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Contact an authorized Bombardier ATV dealer.
2. Engine is running too hot.
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See ENGINE LACKS ACCELERATION OR POWER.
3. Ignition timing is incorrect or there is an ignition system failure.
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Contact an authorized Bombardier ATV dealer.
4. Improper carburetor setting.
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Contact an authorized Bombardier ATV dealer.
Engine misfire
1. Fouled/damaged/worn spark plug(s).
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Clean/verify spark plug(s) and heat range.
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Replace as required.
2. Water in fuel.
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Drain fuel system and refill with fresh fuel.
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