2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 114Get this manual

2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 114

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ENGINE Engine Has Low Power Spark plug fouled Cylinder, piston, ring, or valve wear or damage (check compression) PVT not operating properly Restricted exhaust muffler Carburetor vacuum slide sticking