3
exerts a pre-determined force on the inlet control
lever, which holds the needle on its seat.
A metering diaphragm is subjected to engine suction
on the metering chamber side and atmospheric
pressure on the vented side. Atmospheric pressure
on the vented side pushes the diaphragm toward the
inlet control lever opening the inlet needle to allow
fuel to enter the metering chamber, from which it is
then delivered into the mixing passages.
The inlet control lever hooks on the center of the
metering diaphragm and a self tapping screw holds
the fulcrum pin place.
Movement of the pump diaphragm is caused by
pulsation’s from the engines, acting on it through an
impulse channel. This movement draws fuel into the
fuel chamber and a reverse movement forces fuel out
of the fuel chamber through the inlet needle into the
metering chamber.
An easily accessible fine mesh-filtering screen is
located under the fuel pump cover and diaphragm.
Before disassembling carburetor it is imperative to
blush it clean of sawdust and dirt by pouring gasoline
over it and tools.
1. Remove pump diaphragm cover screws and
cover.
2. Remove pump gasket and pump diaphragm.
3. Remote filtering screen.
4. Remove main diaphragm cover screws and
cover.
5. Remove main diaphragm and gasket (slide
diaphragm towards mixture screws approximately
1/16
th
of an inch and pull up to unhook from the
control lever).
6. Remove fulcrum pin screw, pin, control lever and
spring….
7. Remove inlet needle.
8.
Remove idle and high speed mixture screws and
springs.
Commercial carburetor cleaner can be used on all
parts except diaphragms and gaskets. Before
reassembling, rinse all parts in clean gasoline and
blow off with compressed air. Do not use cloth, as
tiny particles of lint adhering to carburetor parts will
cause malfunction. Channels in the metering body
can be cleaned by blowing through idle and high
speed mixture screw orifices. Do not use wires or
drills to clean orifices.
23(5$7,21$/'$7$
ADJUSTMENT INSTRUCTIONS
Open high speed mixture screw one and one quarter (1¼) turns.
Open idle mixture screw one (1) turn.
SERVICE DATA
HOW TO DISASSEMBLE FOR CLEANING AND REPAIR
To Next Page
Loading...
Need help?
General
