Polaris 2005 SPORTSMAN 500 Servise Manual page 132

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