Possible Cause Remedy
Faulty fuel pressure regulator
diaphragm.
Test and replace if faulty. Do not
attempt to start the engine if the fuel
pressure regulator diaphragm is
ruptured.
Engine Hard to Start, Runs Rough, Misses, and/or Backfires
Possible Cause Remedy
Faulty ignition system component. Service ignition system.
Clogged fuel filter. Replace filters.
Stale or contaminated fuel.
If contaminated, drain tank. Fill with
fresh fuel.
Kinked or clogged fuel line or fuel
tank vent line.
Replace kinked lines or blow out lines
with compressed air to remove
obstruction.
Flame arrestor plugged. Clean or replace the flame arrestor.
Rev limiter engaging at wide‑open
throttle.
Change to propeller with more pitch.
Low Engine Coolant (Closed Cooling) Temperature
Possible Cause
Remedy
Faulty thermostat. Replace.
Poor Performance
Possible Cause
Remedy
Throttle not fully open.
Inspect throttle cable and linkages for
proper operation.
Damaged or wrong 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. Change or clean flame arrestor.
TROUBLESHOOTING
94 eng
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