The X30 Super Shifter Spec. US is specifically engineered around the needs of the American shifter-kart drivers, providing the ultimate driving experience by showcasing a displacement of 175cc. The ideal solution for all drivers wishing to race a top level shifter engine with the benefits and the features of stock class engines. The “Spec. US” combines the performance of the very best KZ engines while offering increased performance, reliability, consistency and ease of use. Provided with the new specifically developed Tillotson HB-15A diaphragm carburetor, an absolute innovation in shifter-kart engines and manufactured with enhanced components to increase longevity and reduce service costs.