O.S. Engines FS-40S - Manual (Page 10)

The FS Series engines are equipped with self-
reopening choke valves.
Cut the choke rod (supplied) to the length indicated,
then secire the rod by tightening the set screw, using
1.5mm Allen wrench (supplied), after installing the
engine.
INSTALLATION OF CHOKE ROD
Choke rod
1.5mm
Allen key
Set-screw
Choke rod
approx.
7mm
approx.
2mm
Frame sides
of fuselage
NEEDLE VALVE EXTENSION
The needle-valve supplied with this engine 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
the L-shaped rod supplied to the required length,
insert it into needle's centre hole and secure it by
tightening the set-screw in the needle-valve knob with
1.5mm. Allen key supplied.
Set-screw
1.5mm Allen key
The direction of the exhaust pipe may be altered in
accordance with individual installation requirements.
The angle is easily adjusted by loosening the nut that
secures the exhaust pipe to the culinder head. Use
the 10mm spanner supplied. Recheck the tightness of
the nut after the engine has been run, but take care
not to touch the exhaust-pipe as it becomes very hot.
EXHAUST PIPE ADJUSTMENT(FS-26S)
Releasing the
choke rod allows
the choke valve
to open.
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