Patent ID: 6427647
Filing Date: 2002-08-06
Classification: F02B,F02M,Y02T

Abstract:
A two-stroke, fuel injected, spark ignited, internal combustion engine comprising:a piston; an engine block subassembly defining a cylinder, a crankcase, and a transfer passage, the piston disposed for reciprocation within the cylinder, the cylinder communicating with the crankcase, the transfer passage communicating between the cylinder and the crankcase, the subassembly further defining an exhaust port communicating with the cylinder, a cylinder injector port communicating with the cylinder, a crankcase injector port communicating with the crankcase and constructed and arranged to communicate with the cylinder injector port, a primary air intake port communicating with the crankcase; a crankshaft engaged to and driven to rotate by the piston; a charge forming device having: a primary air circuit having a primary air mixing passage having an inlet communicating with atmosphere and an outlet constructed and arranged to communicate with the primary air intake pipe, a throttle valve disposed rotateably within the primary air mixing passage, and a primary fuel circuit having an injector mixing passage and a venturi disposed within the injector mixing passage; and an injector circuit having a tuned injector tube communicating adjacent one end with the primary air circuit and the cylinder injector port and adjacent to the other end with the crankcase injector port.