Troubleshooting Engine Problem: Engine Does Not Start (No Spark at Spark Plug) Condition Remedy 1. Ground connections dirty — loose 2. Wiring harness shorting — disconnected 3. Emergency stop switch in DOWN position — malfunctioning 4. Tether cord improperly secured to tether switch — malfunctioning 5. Spark plug fouled — damaged
Problem: Engine Does Not Start (No Fuel at Cylinder) Condition 1. 2. 3. 4. 5. 6.
Gas tank empty Gasoline contaminated Fuel hose broken — pinched Gas-tank vent — hose obstructed Shut-off valve obstructed — damaged Compression absent
Problem: Engine Does Not Start (Fuel Does Not Ignite) Condition 1. 2. 3. 4.
Valve clearance poor Spark absent Compression low Engine flooded
5. Gasoline contaminated
Problem: Engine Does Not Idle Condition 1. 2. 3. 4.
Throttle stop screw turned out too far Idle fuel adjuster screw out of adjustment Air silencer obstructed Drive clutch dirty
Problem: Engine Loses Power Condition 1. 2. 3. 4. 5.
Spark plug fouled External coil faulty Gas tank vent — hose obstructed Compression low Muffler restricted
Problem: Engine Overheats Condition 1. 2. 3. 4. 5.
Drive system adjusted incorrectly — worn — damaged Rings/grooves carboned Exhaust obstructed Compression low — absent Engine shroud obstructed
Problem: Engine Backfires Condition 1. Spark plug fouled — damaged
Problem: Engine Stops Suddenly Condition 1. 2. 3. 4. 5. 6. 7. 8.
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Gas tank empty Spark absent Fuel filter obstructed Gas tank shut-off valve in OFF position Fuel hose obstructed — broken — pinched Ignition coil faulty Engine seized Oil level low
1. Check all ground connections — clean and tight 2. Repair — replace — connect wiring harness 3. Move switch to UP position — test/replace ignition key switch/emergency stop switch 4. Properly secure cord to the switch — test/replace switch 5. Clean — replace spark plug
Remedy 1. 2. 3. 4. 5. 6.
Fill tank Replace gasoline Replace — service hose Remove obstruction — replace vent — hose Remove obstruction — replace shut-off valve Repair — replace damaged — worn engine components
Remedy 1. 2. 3. 4.
Inspect valves Check for spark — see No Spark at Spark Plug sub-section Service engine Clear engine (using a shielded safety stand, elevate the rear of the snowmobile and hold throttle full-open) 5. Clean tank and entire fuel system
Remedy 1. 2. 3. 4.
Adjust throttle stop screw Adjust idle fuel adjuster screw Clean air silencer Clean drive clutch
Remedy 1. 2. 3. 4. 5.
Replace spark plug Service — replace coil Service — replace vent hose Service engine Inspect muffler
Remedy 1. 2. 3. 4. 5.
Troubleshoot — adjust drive system Clean — replace rings — pistons Remove obstruction Repair — replace damaged — worn engine components Clean shroud
Remedy 1. Clean — replace spark plug
Remedy 1. 2. 3. 4. 5. 6. 7. 8.
Fill tank See No Spark at Spark Plug sub-section Replace filter Turn on valve Remove obstruction — repair — replace fuel hose Replace ignition coil Overhaul engine Add recommended oil
