Part-load system (Mikuni BST 40)
The part-load system supplies the engine with fuel while the throttle slide is closed or only slightly
opened.
From the float chamber the fuel enters the mixture pipe through the idling jet. There the fuel
mixes with the air that flows in through the idling air jet.
Then the fuel air mixture reaches the idle adjusting screw and the bypass bores through the
mixture pipe.
A certain amount of the fuel air mixture is sucked into the intake pipe through the bypass bores.
The remaining fuel air mixture is adjusted by the idle adjusting screw and enters the intake pipe
through the idling bore.
8-4E
AIR
FUEL AIR MIXTURE
FUEL
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