TROUBLESHOOTING - 1C-1790-823225--1 1096
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
Accelerator pump
Check for stream of raw fuel from accelerator
pump discharge nozzle, when opening throttle
with engine shut off
Cracked or dirty distributor cap or rotor
Vacuum leak Intake manifold or carburetor base
Spark plugs
Fouled, burned; wrong heat range; cracked
porcelain
Float adjustment
Dirty carburetor
Low compression
Troubleshooting with Vacuum Gauge
Reading Cause
Steady reading between 15-21 inches at idle
RPM
Normal
Extremely low reading, but steady at idle RPM
Vacuum leak; incorrect timing; underpowered
boat; faulty boat bottom
Fluctuates between high and low at idle RPM
Blown head gasket between two adjacent
cylinders
Fluctuates 4 or 5 inches very slowly at idle RPM
Carburetor needs adjustment; spark plug gap
too narrow; valves are sticking
Fluctuates rapidly at idle, steadies as RPM is
increased
Valve guides are worn
Continuously fluctuates between low and normal
reading at regular intervals at idle RPM
Burned or leaking valve
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