O.S. Engines GT55 - Manual (Page 5)

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Be sure to use an effective silencer (muffler).
Frequent exposure to an open exhaust may
eventually impair your hearing. Such noise is also
likely to cause annoyance to others over a wide
area.
Mount the engine in your model securely,
following the manufacturers’ recommendations.
Use a strong enough material for the mounting face of the
model, such as birch ply firewall of more than 8mm thick.
Make sure the mounting face of the model is flat. If it is
uneven, work on it to be flat. (When shims are added to
change the thrust angle, work on it to be flat.)
Engine mounting face has been high-precision machined
flat. Make sure mounting face of the model is also flat.
SILENCER / INSTALLATION
The GT55 does not come with a silencer. Select an
effective silencer from commercially available ones.
(Mounting bolt pattern is the same as most other makes of
the similar engine size.)
Use 5mm steel hex socket head bolts to install the engine.
(Do not use brass, soft steel nor aluminum screws,
because they are not strong enough.)
Also, use the Nord Lock Washers (optional extra) and
other anti-loosening washers or apply locking agent.
Be sure that there is sufficient air intake and outlet area on
the model for engine cooling to avoid overheating.
(Pay careful attention to the cooling since a gasoline
engine generates more heat than a glow engine.)
Secure at least a 30mm dia. area around the air intake of
the velocity stack so that the air intake will not be
restricted. (Cut out the cowling big enough if necessary.)
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Use a tank designed for gasoline.
(Tanks designed for glow fuel use a rubber cap which is
deteriorated by gasoline.)
A 600cc tank will provide 13~14 minutes flight.
Install a commercially available gasoline fuel filter between
fuel tank and carburetor. (Clean the filter from time to time.)
For plumbing use TYGON F-4040 (Yellow color) or strong
nitrile rubber of more than 3mm ID and 6mm OD.
Replace tubing periodically as it becomes hardened.
(Replace tubing inside the fuel tank every six months.)
FUEL TANK & LINES
Use fuel line keepers at the end of the tubing to prevent at
from coming off.
This engine does not require a muffler pressurized fuel
system but be sure to provide an air vent.
Be sure to install an in-line fuel filter between the tank and
carburetor to prevent foreign matter in the tank from
entering the carburetor. Clean the filter periodically.
Be sure to use a gasoline resistant fuel tank cap.
Be sure to equip air vent pipe.
Be sure to use binding band to prevent from coming off.
Be sure to replace piping inside periodically.
To carburetor fuel inlet
Piping for re-fuelling
R