Engine

Optional camshaft kit can be used with stock engine, but delivers improved results when used with 170cc Big Bore kit. CAMSHFT-BIGBORE KIT-GROM

Compression ratio of 11.5 to 1. PISTON - BIG BORE -GROM

Arm made of 6061 aluminum, wheel made of chromium molybdenum steel Long lasting OEM replacement Works with stock engine. CAM CHAIN TENSIONER GROM

Increases the oil flow by 40%, helping to prevent engine failure Keeps the engine lubricated to optimize performance Recommended for bikes with upgraded engines using the Koso North America 170cc Big Bore kit and 4V cylinder head (sold separately). OIL...

Increases the oil flow by 40%, helping to prevent engine failure Keeps the engine lubricated to optimize performance Recommended for bikes with upgraded engines using the Koso North America 170cc Big Bore kit and 4V cylinder head (sold separately). OIL...

Replacement gasket kit for Koso 170CC Big Bore Kit. GASKET KIT BIG BORE -GROM

Throttle body manifold gasket for use with OE or aftermarket manifolds. INTAKE MANIFOLD GSKT GROM

Guards the radiator against road debris Easy to install laser cut honeycomb aluminum mesh screen Includes installation instructions and mounting adhesive Made in the U.S.A.. GUARD RAD IND SCT HNYCMB

Replace worn OEM components Changing the starter pulley is recommended when installing a new rewind starter Handle not included. REWIND STARTER POLARIS

Replace worn OEM components Changing the starter pulley is recommended when installing a new rewind starter Handle not included. REWIND STARTER SKIDOO

High performance, long life, die-cast pistons Engineered to provide the best possible path for combustion chamber heat transfer to cylinder walls All pistons, rings, pins and circlips are manufactured to OEM specifications All individual components will...

High performance, long life, die-cast pistons Engineered to provide the best possible path for combustion chamber heat transfer to cylinder walls All pistons, rings, pins and circlips are manufactured to OEM specifications All individual components will...