50cc High Performance Cylinder Kit for 50cc GY6 QMB139 Scooter Engines

Our 50cc high performance scooter cylinder kit is great for increasing overall performance on small 50cc GY6 QMB139 scooter engines. The 50cc scooter engine kit increases low end acceleration as well as top speed.

This engine kit includes everything shown in the image; cylinder, rings, gaskets, roller weights, and more. This kit also comes with the cylinder head and valves and is our most complete 50cc engine upgrade kit available. This high performance scooter engine kit is easy to install. Combine with a high performance carburetor and high performance exhaust and get peak performance from your 50cc gas scooter.

Note: This high performance cylinder kit is only compatible with 4-stroke 50cc GY6 engines. In addition, a ring compressor may be necessary in order to install the piston in the cylinder included in this kit.

⚠ WARNING California Residents: Proposition 65 Warning

Bore: 39 mm
Piston Height: 33 mm
Cylinder/Cylinder Head hole spacing: 50 mm x 50 mm