Main System - Suzuki VL800 Service Manual

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5-12 FUEL AND LUBRICATION SYSTEM

MAIN SYSTEM

As the throttle valve 1 is opened, engine speed rises and negative pressure in the venturi A increases. This

causes the piston valve 2 moves upward.

The fuel in the float chamber 3 is metered by the main jet 4. The metered fuel passes around main air bleed

pipe 5, mixes with the air admitted through main air jet 6 to from an emulsion and emulsion fuel enters

needle jet 7.

The emulsified fuel then passes through the clearance between the needle jet 7 and jet needle 8 and is

discharged into the venturi A, where it meets the main air stream being drawn by the engine.

Mixture proportioning is accomplished in the needle jet 7. The clearance through which the emulsified fuel

must flow ultimately depends on throttle position.

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Intruder vl800