20
PROBLEM POSSIBLE CAUSE CORRECTION
HARD STARTING
Incorrect use of choke Correct use of choke
Incorrect air/fuel mixture adjustment Set adjustment screw
Incorrect use of throttle setting. See table of data and
adjustments
Restricted fuel filter Replace filter
Restricted low speed jet(s) Disassemble carb
and clean
Restricted vent hole in fuel cap Repair or replace
vent or cap
Float stuck Remove float(s)
check operation.
Rectify problem.
Float damaged or leaking Replace
Incorrect float level Adjust within specs
Intake air leak Check carb rubber
flange for cracks.
Check sealing points
for leaks.
Ignition problem. Repair, replace,
adjust as necessary.
Incorrect spark plug gap. Replace &/or adjust
as per specs.
Low cylinder compression Repair, replace, or
adjust as necessary.
Fuel line blocked Replace fuel line.
Fuel pump unserviceable Repair or replace
Fuel tank empty Fill tank with fuel
Leak or blockage in impulse line
between crankcase and fuel pump Replace line
Engine flooded Remove spark
plugs, dry or
renew the plugs
full throttle,
ignition off,
choke off, turn
engine over a
few times.
Return to normal
position and
settings
Dirty air cleaner Clean or replace
Water in fuel Drain fuel system
POOR IDLE OR STALLING
Idle speed adjustment(s) set too low Adjust idle rpm
Idle speed adjustment(s) are unequal
(twin carb models) Equalize throttle
stop settings
Clogged idle jet or air screw Disassemble carb
and clean
Summary of Contents for F-23
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