2005-2007 Polaris Ranger 500 service manual, Page 125Get this manual
CARBURETION SYSTEM TROUBLESHOOTING
Fuel StarvationLean Mixture
Symptoms: Hard start or no start, bog, backfire, popping through intakeexhaust, hesitation, detonation, low power, spark plug erosion, engine runs hot, surging, high idle, idle speed erratic No fuel in tank Restricted tank vent, or routed improperly Fuel lines or fuel valve restricted Fuel filter plugged Carburetor vent line(s) restricted Plugged or restricted inlet needle and seat screen or inlet passage Clogged jets or passages Float stuck, holding inlet needle closed or inlet needle stuck Float level too low Fuel pump inoperative Air leak at impulse line Restricted impulse line (kinked, pinched) Intake air leak (throttle shaft, intake ducts, airbox or air cleaner cover) Ruptured vacuum slide diaphragm, Vacuum slide stuck closed or sticky Improper spring Jet needle position incorrect Incorrect pilot screw adjustment Poor fuel quality (old fuel) Loose jets Worn jet needleneedle jet or other carburetor parts Dirty carburetor (air bleed passages or jets) Weak or damaged vacuum piston return spring Fouled spark plug