O.S. Engines 12TR - Manual (Page 18)

BALL LINK AND SLIDE VALVE EXTENSION
It is seldom necessary to separate the slide-valve
extension from the slide-valve itself. For cleaning,
withdraw this complete sub-assembly from the
carburettor body after removing the slide-valve guide
screw. Then wash with methanol or glow-fuel.
(Note: take care not to lose the guide screw;it is a
special one.) When it is necessary to adjust the ball-
link position, loosen the ball-link retaining screw with
a 3mm hexagon key, re-align the ball-link and re-
tughten the screw firmly.
(In case of the 10J caburettor)
REALIGNMENT OF MIXTURE CONTROL VALVE
In the course of making carburettor adjustments, it is
just possible that the Mixture Control Valve may be
inadvertently screwed in or out too far and thereby
moved beyond its effective adjustment range.Its basic
position can be found by first rotating the Mixture
Control Valve until its slotted head is flush with the
carburettor body. The valve is then screwed in exactly
2.5 turn to re-establish its neutral position.
Mixture Control Valve
Carburettor Body
First rotate the Mixture Control
Valve until its slotted head is
flush with the carburettor body.
Then screw the valve in exactly
2.5 turn.
This is the standard position.
In case of the 10J caburettor
In case of the 10M caburettor
Carburettor Body
Mixture Control Valve
First rotate the Mixture Control
Valve until its slotted head is
flush with the carburettor body.
Then screw the valve in
exactly 0.5 turn.
This is the standard position.
Throttle Lever
CARBURETTOR CLEANLINESS
The correct functioning of the carburettor depends on its small fuel orifices remaining clear.
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