Big bore cylinder kit for 1200-1270cc conversion on Sportster models.

Increase your horsepower with our V-Twin 1270cc big bore conversion kit. Our kit includes 2 black highlighter finished cylinders, pistons and rings. Cylinders are pre-fitted with a forged piston set with moly rings, ready to install. No machining necessary. *NOTE: Kit can be used for conversion of 1200cc models to 1270cc only. The finish bore is 3.5995" to 3.6005". MC forged pistons have a teflon coated top to aid in a more complete combustion. Final cylinder is done in our 6 position Rottlier honing machine. *NOTE: Includes flat piston set specifically for 1200cc models.