8
Lock Nut
Propeller Washer
Propeller Nut
Cylinder Jacket
Front Housing
Exhaust Pipe
Cylinder Head 1
Drive Hub
Crankcase Under Cover
Cylinder Head 2
Cylinder Head 3
Cylinder Head 4
9
Needle-valve extension
The needle-valve 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. An L-shaped rod, of 1.6-1.8mm dia. and
appropriate length, should be inserted into the needle's
center hole and secured by tightening the set-screw in the
needle-valve knob with a small Allen key. If a longer
extension cable is required it is suggested that one be
fabricated as per the illustration.
NOTE:
O.S. does not offer the extension cable as an accessory
item.
Do not use an excessively long unsupported extension as
this may vibrate and cause the needle-valve setting to vary
or even damage the needle-valve thread. Always provide a
suitable support at the outer end.
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.
M5x15 screw
Lock washer
Set-screw
Set-screw
Hook
Knob
Cable
Needle
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.
