TROUBLESHOOTING
SERVICE MANUAL NUMBER 24
Page 1C-16
90-861327--1 OCTOBER 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
Restricting fuel supply
Plugged fuel tank vent
Improper fuel supply
Refer to “Carburetor Malfunctions”
Incorrect ignition timing
Low grade of fuel or water in the fuel
Spark plugs
Fouled, burned, cracked porcelain, incor-
rect heat range
Spark plug wires
Poor insulation, broken wires
Distributor cap or rotor
Dirty or cracked
Coil
Damaged or malfunctioning
Distributor
Excessive play in shaft
Engine overheating
Refer to “Engine Overheats”
Low compression
Worn valves, rings, cylinders, etc.
Restricted exhaust
Index