Chinese single cylinder air cooled engine

Engine Single Cylinder 4-Stroke 3 HP 196CC Shaft Length 53mm. Shaft diameter 20mm (0.787 inches). H Shaft type flat key shaft Shaft diameter 20mm (0.787 inches) Shaft length 53mm (2.09 inches) Shaft inner diameter thread size 0.8mm (0.0315 inch) Oil system vortex type Engine cooling method forced.