Malossi 70cc High End Racing cylinder with 2-piece modular cylinder head , 7 overflow ports and 2-piece outlet. Great low down when used with the Team II exhaust. Expect to see approx. 20bhp with relevant tuning measures. Crank cases must be worked in order to make the crank stump fit. Only use a crank with 12mm gudgeon pins. Wide range of base gaskets allows for easy adjustment of the compression ratio. All necessary parts supplied.