TROUBLESHOOTING SERVICE MANUAL NUMBER 23
Page 1C-14
90-861326--1 MARCH 1999
Engine Runs Poorly At High RPM
Cause Special Information
Also refer to “Poor Boat Performance”
Crankcase overfilled with oil Check oil level with boat at rest in the
water.
Anti-siphon valve (if equipped) Restricting fuel supply
Plugged fuel tank vent
Fuel supply Refer to “Fuel Injection Troubleshooting,”
SECTION 5D
Ignition timing
Low grade of fuel or water in the fuel
Spark plugs Fouled, burned, cracked porcelain,
incorrect heat range
Spark plug wires Poor insulation, broken wires
Distributor cap or rotor Dirty or cracked
Coil
Distributor Excessive play in shaft
Engine overheating Refer to “Engine Overheats”
Low compression Worn valves, rings, cylinders, etc.
Restricted exhaust
Engine Acceleration Is Poor
Cause Special Instructions
Also refer to “Poor Boat Performance”
Idle mixture screws
Incorrect ignition timing
Incorrect distributor or amplifier advance
curve
Refer to SECTION 4B
Cracked or dirty distributor cap or rotor
Vacuum leak Intake manifold
Spark plugs
Fouled, burned; wrong heat range;
cracked porcelain
Low compression
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