O.S. Engines 12CV-R (P) - Manual (Page 15)

CARBURETTOR CONTROLS (10E-R)
The Needle-Valve:
The Mixture Control Screw:
The Throttle Stop Screw:
Three adjustable controls are provided on this
carburettor.
For adjusting the mixture strength when the throttle
is fully open.
For adjusting the mixture strength at part-
throttle and idling speeds, to obtain steady
idling and smooth acceleration to mid speeds.
NOTE:
Readjustment may
be necessary, occa-
sionally to allow for
changes in fuel, gear
ratio or clutch en-
gagement point. Needle Valve
Mixture Control Valve
Assembly Screw
Throttle
Stop Screw
The somewhat violent changes of vehicle attitude
that occur in off-road running, combined with the
fact that, in buggy type cars, the fuel tank is often
located some distance from the carburettor, means
that fuel 'head' at the carburettor can vary and upset
running.Therefore,it is recommended that a muffler
pressurized fuel feed system be used.
Never run your vehicle without installing the air
cleaner. Dust and dirt that may otherwise be drawn
into the engine will rapidly shorten its life.
PRESSURIZED FUEL SYSTEM
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Silencer
Fuel Tank
Silicone tubing
Connect suitable length of
Silicone tubing between fuel
tank and silencer.
For setting the minimum idling speed:
14
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