CHOKE
SYSTEM
Figures
6-1
and
6-2
The choke system provides a rich fuel-air mixture for
cold weather starting.
When the choke valve is closed, a
low
pressure area
(vacuum) exists at the main nozzle.
A
rush
of
fuel with
relatively small amounts
of
air is obtained from the
main nozzle as the engine is cranked for starting.
Even with a cold engine, this extra rich mixture
makes starting easy.
DISASSEMBLY AND REASSEMBLY
Figures
6-3
-
6-5
Besides mechanical failures, most troubles are
attributed to an incorrect mixing ratio. The most
common causes of incorrect fuel-air mixtures are
clogged jets, restricted air and fuel passages, and
variations in the fuel level. In order to obtain the full
performance
of
the carburetor, the air cleaner and
carburetor must be clean
so
that air and fuel flow
without restriction. Using good quality, fresh, leaded
or unleaded gasoline will help keep the car-
buretor clean.
D
SPRING
13
U
r\
I
"IDLE JET
THROI~LE
SHAFT
CARBURETOR
BODY
FLOAT PIN
~~
NOZZLE
4
>
NEEDLEVALVE
e
MAIN JET
FLOAT
&
FLOAT BOWL
igure
6-3.
Models
WO1-115
and
WO1-150
CHOKE
VALVE
@a-
\
SHAFT
CARBURETOR
BODY
:igure
6-4.
Model
WO1-210
Cleaning
Thoroughly clean all metal parts in a good quality
carburetor cleaner and rinse in cleaning solvent.
Blow out all passages in throttle body and fuel bowl
with reduced air pressure. Check that all carbon
deposits have been removed from throttle bore and
idle discharge holes. Reverse the
flow
of
com-
pressed air through all passages to insure the
removal
of
all dirt. NEVER
USE
A
DRILL OR WIRE
TO
CLEAN OUT JETS OR IDLE HOLES.
Throttle System
Figures
6-3
and
6-4
1.
Remove screws to remove throttle valve and
throttle shaft from carburetor body. Use care to
avoid damaging parts.
2.
Remove throttle stop screw and spring.
6-3
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