61mm Big Bore Bottom End Kit for GY6 180cc, Piston, Rings, Wrist Pin and Cylinder

Upgrade your scooter, ATV, or moped with the RedCap 61mm Big Bore Cylinder Piston Kit, engineered to deliver serious performance gains for GY6 125cc and 150cc engines. Whether you're restoring lost power or chasing higher torque and speed, this 180cc BBK bottom-end kit is built to take your ride to the next level. Precision-crafted from high-quality, heat-resistant materials, it features a 61mm piston and cylinder with a 54mm stud spacing and 64mm outer sleeve diameter—ensuring optimal fitment, heat dissipation, and long-term durability under high RPMs and heavy loads. With improved compression and enhanced combustion efficiency, this upgrade gives you smoother throttle response, better acceleration, and overall enhanced ride quality.

This all-in-one RedCap piston & ring set includes a 61mm piston, matching cylinder, wrist pin, circlips, and both head and base gaskets—everything you need for a hassle-free bottom-end engine rebuild or upgrade. Perfect for a wide range of Chinese-made GY6 4-stroke engines found in scooters, mopeds, and ATVs from brands like TaoTao, Roketa, Coolster, and more, it’s designed for easy installation and dependable performance. Just make sure to verify your engine’s cylinder fin configuration and measurements to ensure compatibility. With RedCap's trusted engineering, this kit offers a reliable and affordable path to better power, cooler operation, and longer engine life.