Modified 125cc large displacement cylinder kit with 54mm bore, suitable for C90 JH90 152FMH engines, off-road motorcycle, off-road vehicle (ATV) upgrade and repair kit.

The GOOFIT 125cc engine kit with a 54mm bore is a powerful modification solution for optimizing the performance of classic small-displacement engines. This kit significantly increases the displacement of the original 152FMH engine (approximately 47mm bore) found in the C90 and JH90 models by replacing the cylinder block and piston with larger 54mm bore versions. The result is a substantial increase in torque and power. The kit includes cylinders, pistons, piston rings, piston pins, circlips, and gaskets, and is specifically designed for off-road motorcycle and ATV riders seeking maximum performance.