TROUBLESHOOTING
71
Engine Runs Erratically
POSSIBLE CAUSES
• Spark plugs fouled or defective. Refer to
Maintenance
section.
• Incorrect setup and adjustments.
• Fuel is being restricted to the engine.
a. Engine fuel filter is obstructed. Refer to
Maintenance
section.
b. Fuel tank filter obstructed.
c. Stuck antisiphon valve on built‑in fuel tank.
d. Fuel line is kinked or pinched.
e. Injector plugged.
• Threaded connection of an air hose is loose.
• Fuel pump failure.
• Ignition system component failure.
Performance Loss at Normal RPM
POSSIBLE CAUSES
• Boat overloaded or load improperly distributed.
• Excessive water in bilge.
• Boat bottom is dirty or damaged.
Performance Loss at Wide‑Open Throttle
LOW RPM (USUALLY ENGINE RELATED)
• Throttle not fully open.
• Exhaust system blocked.
• Ignition system problem.
• Fouled spark plug or failed injector.
• Air compressor inlet blockage.
HIGH RPM (USUALLY PUMP RELATED)
• Damaged impeller.
• Worn impeller or worn wear ring.