O.S. Engines Sirius7 FR7-420 - Manual (Page 6)

10
Exhaust pipe
Exhaust pipe becomes very hot while running and right
after running, make sure it does not touch the model and
never allow hand and body to touch it.
Check the tightness of locknuts while the engine is warm
after the first flight.
10mm wrench
Loosen
Tighten
Lock nut
Exhaust pipe
Carburetor cleanliness
It is recommended that the 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.
Occasionally remove the needle-valve holder from the
carburetor and rinse out the locations shown below with
methanol or fuel. Be careful not to lose the gasket when
removing the needle-valve holder from the carburetor.
Squeeze bottle
Dirt and foreign matter
mostly accumulate here.
Dirt and foreign matter
mostly accumulate here.
Needle-valve holder
11
FUEL TANK & LINES
Make sure that the tank is well rinsed out with methanol or
glow fuel before installation and that the pickup weight is
well clear of the bottom of the tank when held vertically.
A 700cc tank will allow approx. 10 minutes medium speed
flight.
Locate the fuel tank as close as possible to the
carburetor, or the fuel level difference will
affect the engine running when the model is
upright or inverted.
Set the fuel tank position so that the carburetor
center line is 1/3 lower than from the tank top
when the model is placed horizontal.
Approx. 15mm
1/3
Be sure to follow the instructions concerning the
relationship between fuel tank and carburetor position, or
the expected stable idle running will not be obtained even
with adequate carburetor adjustment.
For plumbing, use heavy duty silicone tube of 2.5mm inner
dia and 5mm outer dia.