Till now there has not been a source for an aftermarket thermostat. Quad Logic to the rescue again. This unit drops in just like stock. Replaces Polaris part number 3084940 and 3090049 for all 1996-2013 Sportsman 500s (Including HO, EFI, Touring, X2 and 6x6 models), 2006-07 Sportsman 450s and all 2001-14 Sportsman 400s, Features: Replacement Sportsman 500 Thermostat Includes the rubber seal Replaces Polaris Part number 3084940 and 3090049 Fits all Sportsman 500 engines.
