72cc 47 mm High Performance Big Bore Cylinder Kit for 50cc QMB139 Scooter Engines

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