4-Stroke Petrol Engine

It Demonstrates a normal air cooled, side-valve four-stroke oil motor with the operation of the valves absolutely obvious, cams being driven by a rigging train from back of the principle wrench. Similarly with the two-stroke demonstrate, reenacted start plug uses a little light to demonstrate the terminating point. Screw terminals are given for associations with 3 Volts battery. Cross-segment of carburetter is demonstrated Mounted on base..