4.250" Big Bore Kit

The Revolution Performance 201-616W is a Monster Big Bore Kit engineered to significantly upgrade your motorcycle's engine performance. This kit boasts a substantial 4.250-inch bore, contributing to an increased engine displacement of 143 cubic inches. The 10.8:1 compression ratio is optimized for enhanced power output. Constructed from aerospace-grade all-aluminum, the components in this kit are both durable and lightweight. The kit features a distinct black highlighted finish, adding a custom aesthetic to your engine. This big bore kit is specifically designed for 2017-current 114-inch and 117-inch Milwaukee 8 motorcycles that utilize the Gen I engine.