Leadrise&reg; Kick Start Thump-star / Xsport 90cc 110cc 125cc 140cc Pit Dirt Bike 12mm Kick Start Shafts Includes pinch bolt. Fits 12mm Kick Start Shafts. Fits 90cc, 110cc & 125cc 4-stroke bikes. Fits most Chinese import Pit / Dirt bikes. 100% brand new and never used Kick Start Shafts.