TROUBLESHOOTING
122
Engine Hard to Start, Runs Rough, Misses, and/or
Backfires
Possible Cause Remedy
Faulty ignition system component. Service ignition system.
Dirty fuel filter. Replace filters.
Stale or contaminated fuel.
Drain the fuel tank and fill it with fresh
fuel.
Fuel line or fuel tank obstructed.
Replace damaged lines or clean out lines
with compressed air to remove the
obstruction.
Flame arrestor dirty. Clean or replace the flame arrestor.
Rev limiter engaging at
wide‑open‑throttle.
Use a propeller with more pitch.
Poor Performance
Possible Cause Remedy
Throttle not fully open.
Inspect throttle cable and linkages for proper
operation.
Damaged or incorrect propeller. Replace propeller.
Excessive bilge water. Drain and check for cause of entry.
Boat overloaded or load
improperly distributed.
Reduce load or redistribute load more
evenly.
Boat bottom fouled or damaged. Clean or repair as necessary.
Flame arrestor dirty or restricted. Change or clean flame arrestor.
Stale or contaminated fuel.
If contaminated, drain tank. Fill with fresh
fuel.
Engine Coolant Temperature Too Low
Possible Cause Remedy
Faulty coolant thermostat. Replace water thermostat.
Faulty gauge or sender. Test with shop gauge; test sender.
Faulty oil thermostat. Replace.
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