Carburetor Basics WM 80 Repair
50 wc_tx000522gb.fm
Idle
Once the engine starts, the choke (a) is opened and the throttle (b)
nearly closed. The engine is at the idle state. During idle, low pressure
exists on the engine side of the throttle and atmosphere pressure
(high) on the other. Atmosphere air enters the fuel nozzles (transition
holes) and mixes with the fuel in the idle pocket (c). Fuel is drawn out
of the idle pocket on the engine side of the throttle and into the engine.
Atmosphere pressure presses on the metering diaphragm which
opens the needle valve to keep a supply of fuel in the lower chamber.
A check valve (d) in the main nozzle prevents atmosphere air from
entering the fuel passages.
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