Side draft carburetor for motorcycles

Gas and liquid contact apparatus – Fluid distribution – Valved

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F02M 906

Patent

active

054805929

ABSTRACT:
A side draft carburetor for motorcycles. The carburetor has a body with a horizontal airflow passageway, the airflow through which is controlled by a butterfly valve near the exit side of the carburetor. An upper cylinder is vertically positioned over the airflow passageway and has a large inside diameter portion and a smaller inside diameter portion. A piston member is vertically moveable in the upper cylinder and has an upper piston portion which is fitted in an airtight manner but freely moveable in the upper cylinder and a lower piston member is closely fitted in the lower cylinder. An airflow passageway to the outside of the carburetor body is provided at the base of the upper cylinder. The piston member is closed at the bottom except for an airflow passageway. A tapered needle is held by the piston member and extends downwardly into a jet assembly held in a jet holding member. As air is pulled through the carburetor, the resulting reduced pressure causes the piston member to move upwardly, thereby raising the needle and allowing more fuel to flow in around the needle into the airflow passageway. The piston is light in weight and has only a spring to control its vertical movement in the cylinder. The jet assembly is provided with an adjustment so it can be moved upwardly and downwardly to a preferred level.

REFERENCES:
patent: 3765658 (1973-10-01), Hartel et al.
patent: 4264537 (1981-04-01), Watanabe et al.
patent: 4484557 (1984-11-01), Matsubara
patent: 4500477 (1985-02-01), Zaita et al.

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