O.S. Engines 46LA-S - Manual (Page 10)

NEEDLE-VALVE EXTENSION
The needle-valve supplied with these engines is
designed to incorporate an extension so that, when
the engine is enclosed within the fuselage, the
needle-valve may be adjusted from the outside.
Cut a commercially available rod to the required
length, bend one end to an L shape, insert it into
needle's center hole and secure it by tightening the
set-screw in the needle-valve knob with 1.5mm. Allen
key.
The angled exhaust of the silencer can be rotated to
any desired position in the following manner:
1) Loosen the locknut and assembly screw.
2) Set the exhaust outlet at the required position by
rotating the rear part of the silencer.
3) Re-tighten the assembly screw, followed by the
locknut. The standard silencer is quite effective but
reduces power to some degree.
INSTALLATION OF SILENCER
Assembly screw
Cone baffle
Turn to requlred position
Exhaust outlet
Locknut
Exhaust pressure nipple
Model engines generate considerable heat. Do
not touch any part of your engine until it has
cooled. Contact with the muffler (silencer),
cylinder head or exhaust header pipe, in
particular, may result in a serious burn.
Reminder!
As delivered from the factory, the MAX-40LA & 46LA
have the needle-valve assembly installed vertically.
However, if more convenient for a particular
installation, the needle-valve may be reinstalled
horizontally.
The procedure for relocating the needle-valve is as
follows:
NEEDLE-VALVE LOCATION
9