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Kawasaki KZ1300-A1 Quick Reference Manual Page 168

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MAINTENANCE--ENGINE
to this pressure
difference.
The diaphragm
is
made of
rubber and absorbs the vibration
caused
by engine intake
pulsing to prevent
the
vacuum pistons from
wearing.
The quantity of air drawn
in
by engine
intake is in
direct proportion to engine rpm, and the
speed
of the air
flow is almost constant while the vacuum pistons rise
from
1,4
to
%
throttle. In a conventional
slide·type
car-
buretor, the
size
of the air passage above the needle
jet
changes
with throttle movement rather than with engine
intake
(demand)
.
The venturi effect creates a momen
-
tary drop
in air
flow
speed
when the throttle is opened
suddenly.
This often causes a slight stall in acceleration.
However, the vacuum piston-butterfly
valve
arrangement
controls both the air and
fuel
supplies during
sudden
throttle
movements
for
smooth and
immediate
engine
response.
The coasting enricher system is provided
in
the car-
buretor to prevent backfiring during engine braking by
supplying a rich fuel mixture to the
engine.
The system
includes the
inlet
vacuum passage
CD,
vacuum chamber
CD,
diaphragm
CD
with valve
(J),
return spring
(V,
spring
seat
<D,
cover
CD,
pilot air passage #2
®,
and pilot air
jet#2®.
When the motorcycle is cruising or accelerating, the
engine vacuum is low, and the return spring pushes the
valve toward the extreme right position. At this time,
the pilot air passage #2
is
open, and the air is supplied
to the pilot jet
@
for better atomization through both
pilot air jets #1 and #2.
Coasting Enricher System
1. During cruising or acceleration
1. Cover
5.
Vacuum Chamber
2. Diaphragm
6. Inlet Vacuum Passage
3. Spring Seat
7. Valve
4. Spring
8. Pilot Air Passage #2
Fuel and Air Supply of Enricher System
Fuel Tank • •
~
*Pilot Air Jet #2 is shut off during engine braking.
During engine braking, a high vacuum (low pressure)
is developed at the engine side of the carburetor
bores.
This moves the diaphragm toward the left against the
return spring, and closes pilot air passage #2.
At this
time,
the
fuel mixture is enriched by the amount of air
through the pilot air jet #2 is cut off.
2. During engine braking
,9.
Pilot Air Jet #2
13. Pilot Outlet
10. Pilot Air Passage #1
14.
Butterfly Valve
11
.
Pilot Air Jet # 1
12. Pilot Jet
168

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