Yamaha F50A Service Manual page 19

3. High-speed operation
When the throttle valve approaches its fully open position, the fuel that has been regulated by the
main jet and the air that has been regulated by the main air jet are mixed in the main nozzle. The
resultant mixture is then sprayed by the main nozzle into the venturi. The air-fuel mixture that is
sprayed through the venturi is then fed into the engine.
1
8
1 Pilot screw
2 Pilot outlet
3 Bypass holes
4 Main nozzle
5 Pilot jet
6 Main jet
7 Main air jet
8 Throttle valve
62Y3A11
2
7
4
5
6
È Air
É Air-fuel mixture
Ê Fuel
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