Patent ID: 7168418

Claim:
A heating system for a carburetor comprising: a water-cooled engine having two cylindrical sections and having cooling water piping forming a cooling water flowpath, the flowpath entering an intake port of the first cylindrical section, and passing through a portion of the cooling water piping extending between a discharge port of the first cylindrical section and an intake port of the second cylindrical section; a radiator being positioned in said cooling water flowpath downstream from said engine; a cooling water pump having an intake port, a bypass intake, and a discharge port for circulating a supply of engine cooling water; a thermostat valve provided in the cooling water piping at a position downstream of the engine, wherein an inlet of said radiator is connected to said thermostat valve through said cooling water piping and an outlet of said radiator is connected to the intake port of said cooling water pump through said cooling water piping; and a carburetor, wherein a first portion of the engine cooling water being circulated by the cooling water pump and through the cooling water piping is routed from the cooling water pump through the engine and the radiator and back to the cooling water pump, and a second portion of the engine cooling water is introduced into and through the carburetor through carburetor heating piping directly connected to the carburetor and diverted from a central part the portion of cooling water piping extending between the discharge port of the first cylindrical section and the intake port of the second cylindrical section, said carburetor heating piping including a downstream side and an upstream side, wherein the downstream side of the carburetor heating piping is connected to by-pass piping that connects the thermostat valve and the bypass intake of the cooling water pump, and wherein the upstream side of the carburetor heating piping is connected to the central part of the portion of the cooling water piping extending between the first and second cylindrical sections of the engine in order to divert the second portion of the engine cooling water to the by-pass piping.