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.
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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 1/4” 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 1/4” to prevent vibration from damaging the threads. 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.
2
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 12oz. - 14oz., depending on the
model and the length of flights desired. Use of a 14oz. tank will provide
between 10 - 15 minutes of run time at full throttle. Use of a fuel tank any
larger than 14oz. can lead to excessive leaning of the engine during flight
and is not recommended.
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 choke assembly/
carburetor to the engine. Remove
the carburetor by gently pulling it down off the intake pipe. To reinstall the
carburetor, apply machine oil to the o-ring inside the carburetor mounting
base and reverse the process, making sure to tighten all the bolts securely.
Engine Bolts & Firewall Requirements
Muffler Installation
Fuel Tank Size & Orientation to Carburetor
Carburetor Orientation
Choke Valve
Your XL RFS series engine is equipped with a choke valve to aid in priming
the engine for hand-starting. The
engine is choked by opening the
carburetor barrel completely and
turning the choke lever to close off
the carburetor opening. Fuel can
then be drawn into the engine by
turning the propeller. If the choke
l e v e r i s t o o s h o r t f o r y o u r
particular application, fabricate a
longer choke lever out of 2mm
diameter piano wire and secure it into the choke assembly using the 1.5mm
grub screw. If the choke lever is more than 3" long we recommend supporting
the outer end of it to prevent excessive vibration.
Idle Stop Screw & Rotor Bolt
The idle stop screw adjusts the closure of the throttle barrel. Turning the idle
stop screw clockwise will make
the throttle barrel stay open more.
Turning it counter-clockwise will
allow the throttle barrel to be
closed more. Adjust the idle stop
screw so that you can close the
throttle barrel completely to shut
off the engine. 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, 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.
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.
WARNING
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.
Crankcase Breather Nipple
A nipple is located on the bottom of the crankcase. This is a breather nipple
and should not be plugged or have any part of the fuel system hooked to it.
Ideally, the nipple should be left as-is; however, a short piece of fuel tubing
can be attached to it and run outside of the cowling or fuselage.
WARNING
Do not plug the breather nipple or the engine will not run
properly. If you place an extension on the breather nipple it should not be
more than 3" long.
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