Kroyer Racing Engines 81.5 mm Big Bore CP Piston Kit for Polaris RZR, (also fits Sportsman 800 Motor).
Your stock Polaris motor is only 760cc, the Kroyer Racing Engines big bore kit will increase the bore size to 787cc and include a new cylinder that has already been bored and re-nikasil coated; (2) 81.5mm big bore pistons; new base gasket and big-bore head gasket. Increases power and torque throughout entire RPM range. Designed by Kroyer Racing Engines. Big Bore Cylinder Features: - CNC bored cylinder ensures accuracy and consistency. - Nickel Silicon Carbide cylinder coating (Nikasil) - Refundable Core charge. Useable cylinder required for exchange -OR- $357.73 additional charge for new cylinder. Piston Features Each big bore piston is exclusively designed by Kroyer Racing Engines and machined from designated forgings on a state of the art 5-axis machine and is 45 grams lighter than the OEM pistons and 5 grams lighter than the closest competitorĖs pistons. - Dry Film Lubrication Coating on piston skirts for increased longevity and reduced friction. - Oversized Valve Pockets designed to work with oversized valves. - WPC hard treated wrist pins for extreme durability. - Double Pin Oilers provide twice as much lubrication to the wrist pin. - Anti Detonation Grooves limit the piston/cylinder contact during high temp and RPM. - Accumulator Groove collects excess blow by and residual gases during combustion and alleviates top ring flutter while increasing ring seal. - X-Forging. This design enables the use of a shorter pin for added strength and overall weight savings. - Optimized Cam and Barrel= Tighter clearances; Less noise; Better ring seal; More power; Increased durability.
Each Kit includes: Bored and replated cylinder, Big Bore Piston kit, Gasket set, and new HRP Freeze Plug and a Holz Piston Ring Compressor Tool. Designed to run on 91 octane pump fuel. Will work with stock head and valve train, but are designed to work with Kroyer Racing Engines head and valve train upgrades.
*Cylinder Core Required For Boring and Re-Plating. $357.73 additional charge refundable only after exchange cylinder has been recieved.
ATTN: Core Exchange Holz Racing Products
6226 Chasteen Rd.