Finally a priceworthy option to Takegawa and Kitaco. Amazing quality and same performance as Takegawas 4v SOHC head. 11:1 compression. Head, race cam, roller rockers, 54mm piston kit etc are included. If you want to tune your replica 124cc engine (Lifan, Zongshen, YX dirtmax etc) this is the kit for you. Please note that the piston uses a 14mm pin.