Takegawa 106cc S-Stage bore up kit for CRF50 and 12 volt Z50 is now available in this Hyper S-Stage kit including Deni18 carburetor, intake manifold, throttle kit, air filter, sport decomp camshaft and decomp rocker  set, and high flow fuel petcock for the Z50 (for CRF50 we remove the petcock and add in a CRF50 tank spacer kit). Everything needed to convert your stock 50cc engine to a roaring 106cc monster. Easy top end installation with no case boring or bottom end work.