O.S. Engines Sirius7 FR7-420 - Manual (Page 5)

8
Rocker Cover
Cylinder Head
Exhaust Pipe
Intake Pipe
Back Plate
Carburetor Type 80T
9
Needle-valve extension It is essential that the firewall is strong and rigid (e.g. at
least 15mm thick) and firmly integrated with the structure of
the aircraft.
INSTALLATION
M5 Blind nut
Firewall
M5x25 screw
5 Lock washer
At least 15mm (0.6")
rigid hard wood
It is suggested to install the engine upright.
Set-screw
Knob
Cable
It is suggested to use Lock Washers (available as an
optional extra) with engine installing screws or apply
LOCTITE to the screws to prevent them from loosening.
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. For this purpose, a Needle Valve
Extension Cable Set is supplied with the engine.
If a longer extension is reguired, 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.
Needle Valve Extension Cable Set
Center mark
122mm (4-13/16") dia. circle
Note:
Carburetor installing direction cannot be changed and
the needle direction cannot be changed. Avoid the place
near the exhaust pipe when fixing the extension cable.