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FUEL SYSTEM/CARBURETION
4.18
G Poor fuel quality (old fuel)
G Loose jets
G Worn jet needle/needle jet or other
carburetor parts
G Dirty carburetor (air bleed
passages or jets)
G Weak or damaged vacuum piston
return spring
G Fouled spark plug
POOR IDLE
Idle Too High
G Idle adjusted improperly/idle
mixture screw damaged
G Sticky vacuum slide
G Throttle cable sticking, improperly
adjusted, routed incorrectly
G Choke cable sticking, improperly
adjusted, routed incorrectly
G Plugged or restricted idle jet
Idle Too Low
G Choke cable bending or incorrectly
adjusted
G Idle speed set incorrectly
G Idle mixture screw misadjusted or
damaged
G Belt dragging
G Ignition timing incorrect
G Worn jet needle/needle jet
G Plugged or restricted idle jet
Erratic Idle
G Choke cable bending or incorrectly
adjusted
G Throttle cable incorrectly adjusted
G Air leaks, dirty carburetor passages
(pilot circuit)
G Pilot mixture screw damaged or
adjusted incorrectly
G Tight valves
G Ignition timing incorrect
G Belt dragging
G Dirty air cleaner
G Engine worn
G Spark plug fouled
G Idle speed set incorrectly (speed
limiter)
G Worn jet needle/needle jet
G Plugged or restricted idle jet