TROUBLESHOOTING GUIDELINES
ENGINE CRANKS BUT FAILS TO START (cont’d)
5. Spark plug/ignition (no spark).
– Remove spark plug(s), then reconnect to spark cap. Check that the emer-
gency engine stop switch is at the ON position (up) and the tether cord is
installed. Start engine with spark plug(s) grounded to engine away from
spark plug hole. If no spark appears, replace spark plug. If trouble persists,
contact an authorized Ski-Doo dealer.
6. Engine compression.
– As the engine is pulled over with the rewind starter, “cycles” of resis-
tance should be felt as piston goes past top dead center (each piston on
multi-cylinder engines). If no pulsating resistance is felt, it suggests a major
loss of compression. Contact an authorized Ski-Doo dealer.
ENGINE LACKS ACCELERATION OR POWER
1. D.E.S.S. did not read tether cord cap (D.E.S.S. key) code. D.E.S.S. pilot
lamp blinks once every 1.5 seconds. Engine can not exceed 3000 RPM.
– Properly install tether cord cap (D.E.S.S. key).
2. D.E.S.S. has read a different tether cord cap (D.E.S.S. key) code than the
one programmed. D.E.S.S. pilot lamp blinks rapidly (3 times per second).
Engine can not exceed 3000 RPM.
– Install a tether cord cap (D.E.S.S. key) for which this snowmobile was pro-
grammed.
3. Fouled or defective spark plug.
– Check item 5 of ENGINE TURNS OVER BUT FAILS TO START.
4. Lack of fuel to engine.
– Check item 4 of ENGINE TURNS OVER BUT FAILS TO START.
5. Carburetor adjustments.
– Contact an authorized Ski-Doo dealer.
6. Drive belt worn too thin.
– If the drive belt has lost more than 3 mm (1/8 in) of its original width, it will af-
fect vehicle performance. Replace drive belt.
7. Drive and driven pulleys require servicing.
– Contact an authorized Ski-Doo dealer.
8. 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 au-
thorized Ski-Doo dealer.
ENGINE BACKFIRES
1. D.E.S.S. did not read tether cord cap (D.E.S.S. key) code. D.E.S.S. pilot
lamp blinks once every 1.5 seconds. Engine can not exceed 3000 RPM.
– Properly install tether cord cap (D.E.S.S. key).
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