O.S. Engines 32SX - Manual (Page 23)

SUBSEQUENT STARTING PROCEDURE SUBSEQUENT READJUSTMENT
Once the optimum needle-valve setting has been es-
tablished (see page 19, Needle-valve adjustment dia-
gram) the procedure for starting may be simplified as
follows.
Open the needle-valve one half-turn (180
°
) from
the optimum setting.
Set the throttle one-quarter open from the fully
closed position, energize the glowplug and apply
the electric starter. When the engine starts, re-
open the throttle and re-adjust the needle-valve to
the optimum setting.
When re-starting the engine on the same day,
provided that atmospheric conditions have not
changed significantly, it may be practicable to re-
start the engine on its optimum(running) setting.
Once the engine has been run-in and the controls
properly set up, it should be unnecessary to alter the
mixture settings; except to make minor adjustments
to the Needle-Valve occasionally, to take account of
variations in climatic conditions.
The use of a different fuel, however, particularly one
containing more, or less, nitromethane and/or a
different type or proportion of lubricating oil, is likely to
call for some readjustment of the Needle-Valve.
Remember that, as a safety measure, it is advisable
to increase the Needle-Valve opening by an extra
half-turn counter-clockwise, prior to establishing a
new setting. The same applies if the silencer type is
changed.
A different silencer may alter the exhaust pressure
applied to the fuel feed and call for a revised Needle-
Valve setting. The use of a different glowplug may
also require compensating carburetor readjustments.
Note:
1.
2.
22