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SECTION NINE
Poor High Speed Performance
Fouled spark plugs, incorrect spark plug gap or heat
range
Dirt or water in fuel
Lack of fuel
Restricted exhaust system
Plugged flame arrestor
Insufficient air supply to engine
Engine needs tune-up
9-2
Engine Cranks / Won't Start
Weak or shorted coil; no spark at plugs
Loose engine grounds
Lack of fuel
Weak or discharged battery
Boat Engine Safety switch not attached
Vapor lock
Idle – Misses or Runs Rough
Spark plugs fouled or cracked
Spark plug or distributor wires loose or shorted
Plugged positive crankcase ventilation system
Engine in need of tune-up
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