O.S. Engines 12TG-PX - Manual (Page 8)

14
Carburetor Type 12E
Mixture Control Screw
Throttle
Stop Screw
Needle Valve
Needle Holder
Fuel Inlet
Throttle Lever
The Needle-Valve(Adjusted at the factory):
Three adjustable controls are provided on this
carburetor.
For adjusting the mixture strength when the throttle
is fully open.
The Throttle Stop Screw
(Adjusted at the factory):
For setting the minimum idle speed:
For adjusting the mixture strength at part-throttle
and idle speed, to obtain steady idling and smooth
acceleration to mid speed.
The Mixture Control Screw
(Adjusted at the factory):
NOTE: Readjustment may be necessary,
occasionally to allow for changes in fuel formula,
gear ratio or clutch engagement point.
(It should be screwed in or out less tan one turn.)
15
INSTALLATION OF THE CARBURETOR
As delivered, the engine has its carburetor lightly fit into
the intake boss. Secure it as follows.
Rotate the retainer screw gently until it stops, then
tighten a further 60-90˚. Do not overtighten the
screw as this will damage the carburetor body.
1.
Rotate the retainer nut
gently until it stops. Tighten a further 60-90˚
Fuel Inlet
Needle
Holder
Ball Link
Retaining Screw
Loosen the retainer screw, rotate the carburetor to
its correct position and make sure that it is
pressed well down into the intake boss,
compressing the rubber gasket, before
retightening the screw.
NOTE
As delivered, the engine has its carburetor
lightly fit into its intake. Secure it changing its
angle according to the car chassis.
2.
When changing the ball link direction, loosen the
retaining screw with a 1.5mm Hex wrench.
After changed the fuel inlet direction, tighten the
needle holder slowly and gently until it stops. Then,
tighten 45~60 degrees further. Do not tighten further
or the fuel inlet will be distorted, which may result in
fuel leaking.