4.8
FUEL SYSTEM / CARBURETION
STARTER SYSTEM (CHOKE OR
ENRICHMENT)
When the choke cable (1) is activated, the starter plunger
(5) is lifted off the seat.
Fuel is drawn into the starter circuit from the float
chamber (2) through the starter jet (3). Starter jet meters
this fuel, which then flows into starter pipe (4) and mixes
with the air (7) coming from the float chamber. The
mixture, rich in fuel content, reaches starter plunger and
mixes again with the air coming through a passage (8)
extending from underneath the diaphragm. The rich fuel/
air mixture for starting is discharged through starter outlet
(6) in the main bore.
PILOT (IDLE AND SLOW) SYSTEM
This system supplies fuel during engine operation with
throttle valve closed (1) or slightly opened. The fuel from
float chamber (2) is metered by pilot jet (3) where it mixes
with air coming in through pilot air jet (4). The mixture
then goes up through pilot passage to pilot screw (5). A
part of the mixture is discharged into the main bore out of
bypass ports (6). The remainder is then metered by pilot
screw and discharged into the main bore through pilot
outlet (7).
1
2
3
4
5
6
7
8
4
1
6
7
5
2
3
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