PETROL ENGINE FOUR STROKE (LSE) Represents a typical air cooled, side –valve four stroke petrol engine with the operation of the valves clearly evident, cams being driven by a gear train from rear of the main crank. As with the two-stroke model, simulated spark plug uses a small lamp to indicate the firing point. Screw terminals are provided for connection to 3 Volts battery. Cross-section of carburetor is shown. Mounted on polished wooden base. With printed diagram. Qty :