72cc 47 mm High Performance Big Bore Cylinder Kit for 50cc QMB139 Scooter Engines Shoprider Jetstream L (888WAL) 5 mm outside diameter and

5 mm outside diameter and a 2

Note: This assembly does not include keys

The second-generation Companion II four-wheel can take a lot of hard use and abuse

The bead-to-bead measurement is 2-3/8"" and it has what is referred to as a "narrow lip" profile

72cc 47 mm High Performance Big Bore Cylinder Kit for 50cc QMB139 Scooter Engines Shoprider Jetstream L (888WAL) 5 mm outside diameter andOur 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