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10. METERING DIAPHRAGM
The metering diaphragm has the function of operating the metering lever, which is pulled up by the
variations in the negative pressure of the engine
11. METERING LEVER
The metering lever has the function of opening/shutting the inlet needle valve by transmitting the
movements of the metering diaphragm to that valve
12. METERING LEVER SPRING
The metering lever spring has the function of pushing up the metering lever, thereby shutting the needle
valve when the engine is stopped and when the metering chamber is full of fuel
13. METERING CHAMBER
The metering chamber is the fuel storage compartment that has the function of supplying fuel to the
nozzle holes and other parts
14. FIRST IDLE HOLE
The first idle hole is the only fuel supply hole that is available when the engine is idling
15. SECOND AND THIRD IDLE HOLES
The second and the third idle holes have the function of supplying fuel when the throttle is at an
intermediate opening state between the idling state and the fully open state
16. IDLE NEEDLE
The idle needle has the function of controlling the fuel when the engine is at idling speeds and when the
throttle is at a low speed position
17. HIGH SPEED NEEDLE
The high speed needle has the function of controlling the fuel when the engine is operating at high
speed and when the throttle is at a high speed position
18. MAIN NOZZLE
The main nozzle is the hole through which fuel is ejected when the engine is operating at high speed
and when the throttle is at a high speed position
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