Your stock Polaris motor is only 760cc, the big bore kit will increase the bore size to 860cc and include a new cylinder that has already been bored and sleeved  (2) 85 mm big bore pistons; new base gasket and big-bore head gasket. Increases power and torque throughout entire RPM range. Distributed by Ricochet Racing.

Big Bore Cylinder Features: Each big bore core is completely machined from high grade aluminum and CNC’d to spec, once the cylinder core is completed and QA’ed , it is then inserted into a special oven and heated to the correct  temperature   to accept the cylinder sleeve, it is then placed into a special press and the steel sleeve is inserted.  Once complete a final inspection is done assuring that the parts are all true and ready for delivery.

Piston Features

Each big bore piston is 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 competitor’s 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.

Designed to run on 91 octane pump fuel – Will work with the stock head and valve train, but are designed to work more efficiently and a larger gain in horsepower was obtained paired with the Ricochet Racing  head and valve train upgrades.