BRK Racing 74cc Derbi Variant Start Cylinder

The BRK Racing 74cc cylinder for Derbi Variant Start is a high-performance tuning kit made of aluminum, designed to significantly increase engine power compared to the original cylinder. It uses a 47.6mm diameter, single-ring piston, which reduces internal friction and improves engine response, especially at high RPMs.

This cylinder incorporates six transfer ports and an exhaust system with two boosters , a configuration that optimizes cylinder filling and emptying, resulting in improved acceleration and more aggressive performance. It is designed for Derbi Variant Start and Variant Start 5 engines, specifically models equipped with an air-cooled engine and a 12mm wrist pin.

The kit is supplied without a cylinder head , so a compatible one is required (generally the specific BRK cylinder head for Ø 47.6 mm). This cylinder is designed for racing or tuning applications, ideal for those seeking a significant performance increase, improved torque, and more energetic operation across the rev range.