User Manual

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 1/4" thick and the firewall should
be reinforced to meet the torque and weight of the engine.
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The muffler is mounted to the engine using the two steel socket-cap screws,
two split washers and one of the two gaskets provided. The second gasket
should be kept as a spare. Tighten
both screws firmly to prevent the
muffler from loosening during
flight. The exhaust cone on the
back of the muffler can be adjusted
to better match the installation of
your particular application. To
adjust the exhaust cone, loosen
the retaining nut using an adjustable
wrench. Rotate the cone to the
desired angle and tighten the retaining nut completely while holding the axial
bolt in place from the front of the muffler, using a flat blade screwdriver. It is
important to tighten the retaining nut firmly to prevent the exhaust cone from
loosening during flight.
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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 10oz. - 12oz., depending on the
model and the length of flights desired. Use of a 12oz. tank will provide
between 10 - 15 minutes of run time at full throttle. Use of a fuel tank any
larger than 12oz. can lead to excessive leaning of the engine during flight
and is not recommended.
The carburetor is held in place using two socket-cap screws. Slide the base
of the carburetor into the crankcase,
being careful to keep the carburetor
perpendicular to the front of the
engine. Using your thumb, push
down firmly on the carburetor so
that the base of the carburetor
sets completely into the crankcase.
An o-ring is installed on the
carburetor throat to seal the joint.
While holding the carburetor firmly
down into place, install and tighten the socket-cap screws using the hex
wrench provided.
Engine Bolts & Firewall Requirements
Muffler Installation
Fuel Tank Size & Orientation to Carburetor
Carburetor Installation
Rear Needle Valve Assembly Installation
The rear needle valve assembly is held in place using the two socket-cap
screws and two split washers
provided with the rear needle
valve assembly. To mount the
assembly, remove the two upper
backplate screws, set the assembly
in place, then install and tighten
the two longer socket-cap screws
and split washers. Carefully
install the length of silicon fuel line
provided between the needle
valve assembly and the carburetor. The fuel pick-up line from your fuel tank
will connect to the larger brass nipple on the needle valve assembly.
Standard-Mount Needle Valve Assembly Installation
It is not necessary to use the rear-mounted needle valve assembly with your
engine. You can easily mount the
needle valve into the side of the
carburetor if you wish.
Using an adjustable wrench,
carefully loosen and remove the
plug from the side of the carburetor.
Carefully loosen and remove the
needle valve assembly (including
the clear gaskets) from the rear
needle valve mount. Carefully thread the needle valve assembly (with the
clear gaskets in place) into the side of the carburetor and tighten it securely
using an adjustable wrench.
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 set screw in the side of
the needle valve, 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.
Carburetor Rotor Bolt
The rotor bolt assembly holds the throttle barrel in the carburetor body and
requires no adjustment. As part of your maintenance schedule you should
periodically check that the rotor bolt and nut are tight.
Propeller Installation
IMPORTANT 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.
Using a 1/4" drill bit or a prop reamer, enlarge the hole in the propeller hub to
fit the crankshaft. The diameter of the crankshaft is 1/4". Slide the