Service manual

TROUBLESHOOTING SERVICE MANUAL NUMBER 26
Page 1C-20 90-861329--1 MARCH 1999
Engine Runs Poorly At High RPM (continued)
Cause Special Information
Coil
Distributor Excessive play in shaft
Engine overheating Refer to “Engine Overheats”
Low compression Worn valves, rings, cylinders, etc.
Restricted exhaust
Poor Fuel Economy
Cause Special Information
Fuel leaks
Operator habits
Prolonged idling; slow acceleration; failure
to cut back on throttle once boat is on
plane; boat overloaded; uneven weight
distribution
Engine laboring
Bent, damaged or wrong propeller. Water
test boat for proper operating rpm at wide
open throttle
Clogged flame arrestor
Engine compartment sealed too tight Not enough air for engine to run properly
Boat bottom Dirty (marine growth), hook, rocker
Carburetor
Idle mixture settings, accelerator pump
adjustments, linkage binding, choke
adjustment, carburetor flooding over, main
fuel jets
Improper fuel
Crankcase ventilation system not working
Engine needs tune-up
Engine running too cold or too hot
Plugged or restricted exhaust
Engine Low compression
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