... start popular 70cc dirt bike 1. Engine: 70cc 2-valve, 4-stroke, single cylinder, air-cooled2.Starter: kick + electric start ... x stroke: 50 x 49.5mm (70cc, 2-valve),4. Compression ratio: 8.2:1, 8.8:1, 9 ... .0:15.Ignition: CDI6.Transmission: manual with 4 speeds7.Seat height: 740mm8.Wheel base: 1,120mm9.Tank ... 72pcsQty/40' HQ: 171pcs 70cc dirt bike manual with 4 speeds kick + electric start motorcycle