24
SUBSEQUENT STARTING PROCEDURE
SUBSEQUENT READJUSTMENT
Once the optimum needle-valve setting has been es-
tablished (see page 21, 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.
25
CARBURETOR CLEANLINESS
ENGINE CARE AND MAINTENANCE
At the end of each operating session, drain out any
fuel that may remain in the fuel tank.
Next, energize the glowplug and try to restart the
engine to burn off any fuel that may remain inside
the engine. Repeat this procedure until the engine
fails to fire. Remove the glowplug and eject any re-
sidue by rotating the engine with an electric starter
for 4 to 5 seconds while the engine is still warm.
Finally, inject some after-run oil into the engine.
Rotate the engine a few times by hand, to make
sure that it is free, and then with an electric starter
for 4 to 5 seconds to distribute the oil to all the
working parts.
Do not inject after-run oil into the carburetor as
this may cause the O-ring inside the carburettor
to deteriorate.
These procedures will reduce the risk of starting
difficulties and of internal corrosion after a period of
storage.
The correct functioning of the carburetor depends on
its small fuel orifices remaining clear. The minute
particles of foreign matter that are present in any fuel,
can easily partially obstruct these orifices and upset
mixture strength so that engine performance
becomes erratic and unreliable.
O.S.'Super-Filters'(large and small ) are available, as
optional extras, to deal with this problem.
One of these filters, fitted to the outlet tube inside
your refueling container, will prevent the entry of
foreign material into the fuel tank.
It is also recommended that a good in-line filter be
installed between the tank and needle-valve.
Do not forget to clean the filters regularly to remove
dirt and lint that accumulate on the filter screen.
Also, clean the carburetor itself occasionally.
Note:
1.
2.
3.
