Top-class aluminum cylinder kit from Top Performances with 78.5cc capacity and 50mm bore. The hard-chrome plated cylinder bore and the two-part, trapezoidal exhaust port are just a few special features of this product. The modular cylinder head provides excellent cooling and, together with the aluminum construction, aids the cylinder with optimal heat dissipation. No stone left unturned when it comes to power! The cylinder kit course is supplied completely as shown. Racing exhaust and suitable carburetor are a must.