70cc 2-Stroke Big Bore Kit For Chinese Scooters. This kit has a 47mm cylinder bore, 10mm wrist pin and pin bearing. 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. Type:Big Bore Rebuild Kit Condition: Wrist Pin Length: 36.8mm Wrist Pin Diameter: 10mm Piston Diameter: 47mm Displacement: 70cc Fitment: Fits for Most Chinese Scooters With Jog / for Minarelli / for Clone Motors Fits for Jonway, for Jmstar Roketa, for Sunl, for and Many Others Note:The gasket color is random, and the specification is not accepted. Color:Silver Gray Material:Metal Package Contents: 1 x Master cylinder 1 x Piston ring kit 1 x Wrist pin 2 x Clamp ring 1 x Piston 2 x Paper gasket 1 x Rolling pin bearing Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.