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The engine should be mounted to either a heavy-duty, glass-filled nylon
engine mount, a machined aluminum engine mount or an integrated hardwood
beam mount. Use only high-quality steel cap screws and related hardware
to mount the engine to the engine mount. The firewall in the airplane should
be aircraft grade 5-ply plywood no less than 5/16" thick and the firewall should
be reinforced to meet the torque and weight of the engine.
Engine Bolts & Firewall Requirements
The muffler threads onto the exhaust pipe, which then threads into the engine's
cylinder head. First thread one cinch nut onto each end of the exhaust pipe,
then thread the muffler onto one
end. The muffler should be
threaded on at least 5/16" to
prevent vibration from damaging
the threads. Once you have
threaded the muffler onto the
exhaust pipe, use an open end
wrench to firmly tighten the cinch
nut up against the muffler. The
exhaust pipe is adjustable to
better suit the installation of your particular application. Thread the exhaust
pipe into the engine’s cylinder head. The exhaust pipe should be threaded
in no less than 5/16" to prevent vibration from damaging the threads in the
cylinder head. Once you have threaded the exhaust pipe into place and into
the proper position for your application, use an open end wrench to firmly
tighten the cinch nut against the cylinder head.
Muffler Installation
Ideally, the stopper in the fuel tank should be even with the high speed needle
valve or just slightly below it. Some models will only allow the fuel tank to be
mounted higher than the ideal location. A fuel tank that is positioned higher
than the ideal location usually doesn’t pose any problem except when it is
mounted excessively higher and/or is used in conjunction with an inverted
mounted engine or during extreme aerobatic flight. If you mount the engine
inverted, we strongly suggest lowering the fuel tank so the stopper assembly
is slightly below the high speed needle valve. Doing this will prevent fuel
from siphoning into the engine and flooding it when the fuel tank is full. If
you cannot lower the fuel tank far enough, we suggest lowering it as far as
can be allowed in your particular application.
The size of the fuel tank used should be 20oz. - 24oz., depending on the
model and the length of flights desired. Use of a 24oz. tank will provide
approximately 15 minutes of run time at full throttle. Use of a fuel tank any
larger than 24oz. can lead to excessive leaning of the engine during flight
and is not recommended.
Fuel Tank Size & Orientation to Carburetor
In some cases you may want the throttle arm on the opposite side of the
e n g i n e from h o w i t c o m e s
preinstalled. You can remove the
carburetor and reinstall it in the
opposite direction with no effect on
performance. To remove the
carburetor, loosen the two screws
holding the intake manifold in
place. Next, remove the two
screws holding the carburetor to the
engine and remove it by gently
pulling it down off the intake pipe. Installation is the reverse of disassembly.
Be careful not to damage the O-ring when reinstalling the carburetor.
Carburetor Orientation
Rotor Bolt
The rotor bolt holds the throttle barrel in the carburetor body and prevents
the throttle barrel from being over-rotated in either direction. It does not require
adjustment. Periodically check the rotor bolt to ensure that it is tight.
Optional Needle Valve Extension
If an extension is required to
adjust the high speed needle
valve, use a 1.5mm diameter wire
of the necessary length. Loosen
the grub screw in the side of the
needle valve (using a 1.5mm hex
wrench), insert the wire into the
end of the needle valve and
tighten the set screw firmly. If the
extension is more than 3" long we
recommend supporting the outer end of the extension to prevent excessive
vibration from damaging the needle valve assembly.
Crankcase Return Tube
A silicone crankcase return tube
is attached to the engine, between
the crankcase and the intake pipe.
This tube carries excess oil back
into the intake so it can be
redistributed t h r o u g h o u t t h e
engine. This system keeps the
engine better-lubricated. DO NOT
plug the tube or run the engine
without the tube attached.
Propeller Installation
Your engine comes equipped with a main propeller nut and one safety nut.
For your safety, we recommend using both the propeller nut and the safety
nut to secure the propeller into place.
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WARNING
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Before installing the propeller it must be properly balanced.
Running your engine using an out-of-balance propeller can lead to
excessive vibration, which will result in excessive stress and wear on both
the engine and the airframe. Balance the propeller using the method
recommended by the propeller manufacturer. Several products are
available to properly balance propellers. Ask your local retailer for more
information about these items.
The diameter of the crankshaft is 3/8". Using a 3/8" drill bit or a prop reamer,
enlarge the hole in the propeller
hub to fit the crankshaft. Slide the
propeller onto the crankshaft, up
against the drive washer. Slide
the propeller washer up against
the propeller and thread the main
prop nut into place. Tighten the
prop nut firmly to secure the propeller
into place, then install and tighten
the safety nut against the prop nut.
When tightening the nuts, use an adjustable wrench. Do not use pliers.
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WARNING
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If you are installing a spinner onto your engine, the cone
of the spinner must not rub against the propeller. Allowing the spinner
cone to rub against the propeller could lead to propeller damage and
eventual propeller failure.
NOTE: EXHAUST PIPE THREAD SIZE IS M14x0.75mm
NOTE: PROPELLER SHAFT THREAD SIZE IS 3/8"-24
