Patent ID: 6286467
Filing Date: 2001-09-11
Classification: F02B

Abstract:
A method of converting to two stroke operation a four stroke internal combustion engine having a plurality of pistons arranged for reciprocating movement within respective cylinders, an inlet valve and an exhaust valve associated with each cylinder, a crankshaft coupled to the pistons, the crankshaft being driven to rotate by reciprocation of the pistons, an original camshaft assembly coupled to the crankshaft, the camshaft assembly comprising at least one original camshaft carrying a plurality of original cams for actuating respective inlet and exhaust valves, an original drive assembly coupling the camshaft to the crankshaft such that the camshaft is rotated at half a speed of the crankshaft, and electronic fuel injection for injecting fuel into the respective cylinders; said method comprising:providing a replacement camshaft assembly for actuating the respective inlet and exhaust valves, the replacement camshaft assembly being arranged to open each of the valves once per revolution of the crankshaft;replacing the original camshaft assembly with the replacement camshaft assembly: andprogramming the electronic fuel injection to inject fuel in each cylinder once per revolution of the crankshaft.