RACE PORTED Zenoah 25.4cc 34mm Big-Bore Kit

These big-bore kits have been ESP (Earth Surfer Products) race ported - intake, exhaust, and transfer ports have been enlarged/reshaped for more fuel/air flow and hence more power. 34mm big bore cylinder kit for CY23RC, G23LH, and G230RC engines. Also works as a replacement top end for G260RC and CY26RC engines. Includes cylinder, piston, ring, piston pin, circlips, base gasket, and spark plug. Increases displacement to 25.4cc (34mm bore). Increases engine power and speed SUBSTANTIALLY! This high-performance product requires 91 octane (using the R+M/2 octane rating method) or higher fuel, and comes without warranty. Note: if installing this product onto a Chung Yang engine (CY23RC, CY26RC, etc), you will need to use a Zenoah pin bearing (ca217) and Zenoah pin washers (ca216).