2005 Polaris Sportsman 400/500 Service Manual, Page 131Get this manual

2005 Polaris Sportsman 400/500 Service Manual, Page 131

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FUEL SYSTEMCARBURETION G 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