50cc 2-stroke air cooled Parameters:

Technical criteria
Type	Single cylinder\2-strokes\forced air-cooled
Cylinder(mm)	40
Piston displacement(mm)	39.2
Displacement(ml)	49.26
Nominal power(kw/rpm)	3.1/7000
Max power(kw/rpm)	3.4/7500
Max Torque(N.m/rpm)	4.3/7000
Idle(r/min)	1800+/-100

This type of engine has general crankcase and lengthening crankcase available.