Ski-Doo 1997 FORMULA 500, Operator'S Manual

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109
SYMPTOM:
Engine lacks acceleration or power
Possible causes What to do
1. Fouled or defective spark plug. Check item 5 of “Engine turns over but
fails to tart”.
2. Lack of fuel to engine. Check item 4 of “Engine turns over but
fails to start”.
3. Carburetor adjustments. Contact an authorized dealer.
4. Drive belt worn too thin. If the drive belt has lost more than
3 mm (1/8 in) of its original width, it
will affect vehicle performance.
5. Drive and driven pulleys require
servicing.
Contact an authorized dealer.
6. Engine is overheating. On liquid cooled engines, check
coolant level, pressure cap,
thermostat and for air locks in cooling
system.
On fan cooled engines, check fan belt
and its tension; clean cooling fins of
engine; if overheating persists,
contact an authorized dealer.
SYMPTOM: Engine backfire
Possible causes What to do
1. Faulty spark plug
(carbon accumulation)
See item 5 of “Engine turns over but
fails to tart”.
2. Engine is running too hot. See item 6 of “Engine lacks
acceleration or power”.
3. Ignition timing is incorrect or there
is an ignition system failure.
Contact an authorized dealer.