2-11
TECH
FEA
Technical features and description
High speed operation
When running at high speed, the throttle valve opening is near the fully open position, and the neg-
ative pressure generated in the main bore
a
becomes even higher. Consequently, a larger amount
of air and fuel mixture is drawn from the main nozzle
a
to be supplied to the engine.
At high speed operation, as the negative pressure in the main bore
a
becomes higher than the neg-
ative pressure in the pilot passage
b
, fuel is not drawn through the pilot jet
c
.
A
Air
B
Fuel
C
Air and fuel mixture
A
B
C
c
a
b
a
Summary of Contents for F4B
Page 1: ...SERVICE MANUAL 6BV 28197 3M 11 F4B F5A F6C ...
Page 4: ......
Page 16: ...0 11 GEN INFO General information MEMO ...
Page 66: ...5 7 ELEC Electrical system MEMO ...
Page 160: ...8 19 LOWR Lower unit MEMO ...
Page 180: ...9 19 BRKT Bracket unit MEMO ...
Page 198: ...i 5 Index MEMO ...
Page 201: ......
Page 202: ...Jan 2019 ABE E_3 ...