Yamaha 25BMH Manual page 18

GEN
TECHNICAL TIPS
INFO
E
(3) High engine speed
In the high engine speed where the throttle valve is fully open, the fuel delivered through the
main jet is mixed with the air delivered through the main air jet, which is fed into the venturi
through the main nozzle.
Air/fuel mixture delivery through the bypass holes and the pilot outlet continues in the high
engine speed.
Fig. 13
1-17