Vertex Complete Engine Rebuild Kit Polar Sportsman XP 850 / Touring Vertex's Engine Rebuild Kits come fully packed with all the necessary parts and gaskets for a comprehensive engine rebuild or refresh. These kits can potentially save, on average, 400 in comparison to buying OEM components and between 7-15 when compared to purchasing aftermarket rebuild components separately. Helping to save money, down time and effort. The included pistons in Vertex's Complete Engine Rebuild Kits are of the stock size. Furthermore, for those rebuild ventures that require honing or machining of the cylinder wall, Vertex offers OS Engine Rebuild Kits which sport all the same rebuilding hardware, with an added oversized piston (+0.5-3.0mm larger than OE piston diameter). Includes: Vertex piston kit (same diameter as stock) Standard compression piston, rings, pin and clips Hot Rods heavy-duty crank Stock stroke On two-stroke applications, includes wrist pin bearing Hot Rods main bearing / seal kit Hot Rods transmission bearing kit Includes transmission bearings, output shaft collar and sprocket lock washer Hot Rods counter balancer bearing kit Hot Rods water pump bearing and seal kit Vertex complete gaskets kit Including seals and O-ring kit (covers top and bottom) Hot Cams cam chain Note : Images for reference only. Kit contents vary with machine and application.