This kit has a 47mm cylinder bore and 10mm wrist pin.
Includes wrist pin bearing.
47mm Big Bore Head Kit for 50cc 2-stroke 40QMB, E40QMB, 1E40QMB AND 1PE40QMB Minarelli engines to increase drive power.
Please make sure to compare your old parts to the photos provided.
Also this kit for 100mm wrist pin.
Type: Big Bore Rebuild Kit
Condition: Brand New
Wrist Pin Length: 36.8mm
Wrist Pin Diameter: 10mm
Piston Diameter: 47mm
Package Included: 1 x Master cylinder 1 x Cylinder head 1 kit x Piston ring 1 x Wrist pin 2 x Clamp ring 1 x Piston 2 x Paper gasket 1 x Rolling pin bearing
Fitment: Fits most Chinese scooters with jog / Minarelli / Yamaha clone motors Fits Jonway, Jmstar, Roketa, Sunl, Yamaha and many others
Disclaimer: Nicecnc Store parts are not sponsored or endorsed by, or affiliated with the brands its parts fit, including Harley-Davidson，KTM, Duke，Aprilia，Triumph，Husqvarna, Honda, Yamaha, Kawasaki, Suzuki, Beta, GASGAS, Sherco, Polaris, Can-am, Arctic Cat, Ski-Doo，Piaggio, Ducati, MV Agusta, Moto Guzzi, Benelli, Buell, CF-Moto, Enfield, Hyosung, Indian,etc.