Description

Our 72cc scooter big bore cylinder kit is great for increasing overall performance on small under-powered 50cc QMB139 scooter engines.
Engine kit increases engine bore size from 50cc to 72cc and includes everything shown in the image; cylinder, rings, and gaskets.
This 72cc scooter engine kit increases low end acceleration as well as top speed.
This high performance scooter big bore 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 QMB139 engines. Specifications

Bore: 47 mm
Piston Height: 33 mm
Cylinder/Cylinder Head hole spacing: 50 mm x 50 mm
Piston Wrist Pin Diameter : 12 mm
Piston Wrist Pin Length: 37 mm
Compression height : 17 mm
Ring Diameter: 47 mm Compatibility

Tank Urban 50