The ultimate 88cc big bore kit for Honda CRF50 CRF70 from Takegawa. 88cc all aluminum cylinder with high compression piston, +R Superhead with roller rockers, 28.5mm intake valve, 23.5 exhaust valve, titanium retainers, S-12D auto decompression camshaft for easier starts and longer life.  Also available S15-D S-20D S-25D S-30D and S-35D camshafts.