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Ô Smene
E SUBSEQUENT
READJUSTMENTS
Once the engine has been run-in and the carburetor
controls properly set up, it should be unnecessary to
alter the mixture
settings, except to make
minor
changes
to the Main
(High-Speed)
Needle
Valve
occasionally, to take account of differences in climatic
condisitions.
However,
as
previously
mentioned,
the
use
of a
different fuel, particularly one containing
more,
or
less,
nitromethane
and
/ or a different
type or
proportion of lubricating oil, is likely to call for some
modification
to
the
High-Speed
Needle-Valve
adjustment.
As a safety measure, it is advisable to increase the
High-Speed
Needle Valve setting by an extra half-
turn counter-clockwise, prior to establishing the 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, or changes to the
main
rotor and
its pitch angles
may
also require
compensating carburetor readjustments.
34
E CARBURETOR
CLEANLINESS
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. It is recommended
that fuel is passed through a filter when the tank is
filled and that a good in-line filter is installed between
the fuel tank and carburetor and, furthermore,
that
this filter is frequently cleaned
to remove
foreign
matter that accumulates on the filter screen. Finally,
occasionally remove the needle-valve holder from the
carburetor
as shown
in Picture
and
extract
any
remaining foreign matter that may have lodged in the
location shown in Picture below.
Remove this with
an 8mm wrench
Dirt and foreign matter
mostly accumulate here
Fi
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