Engine Bolts and Firewall Requirements
The engine should be mounted to either a glass-filled nylon engine mount,
a machined aluminum engine mount, or an integrated hardwood beam
mount. Use only high-quality 4-40 or 3mm steel socket-cap screws and
related hardware to mount the engine to the engine mount. The firewall in the
aircraft 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.
Fuel Tank Size and Orientation to Carburetor
Ideally, the stopper in the fuel tank should be level 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. 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. to 12oz., depending on the
model and the length of flights desired. Use of a 10oz. tank will provide
approximately 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.
Carburetor Orientation
You can remove the carburetor and reinstall it 180º in the opposite direction
with no effect on performance. To
remove the carburetor, remove
the two screws holding the
carburetor in place, then gently
pull the carburetor straight down
off the intake pipe. To reinstall
the carburetor, apply machine
oil to the o-ring inside the top of
the carburetor and reverse the
process, making sure to tighten
the carburetor retaining bolts securely. You will need to angle the top of the
carburetor slightly toward the engine when reinstalling it. Be careful not do
damage the O-ring.
Muffler and Exhaust Pipe Installation
The muffler and two cinch nuts come preinstalled on the exhaust pipe. The
exhaust pipe is adjustable to
better suit the installation of your
particular application. To install
the assembly onto the engine,
thread the exhaust pipe as far as
possible into the engine’s cylinder
head. Rotate the exhaust pipe
so that the muffler is properly
positioned for your application,
then use an open end wrench to
firmly tighten the cinch nut against the cylinder head.
WARNING
The muffler and exhaust pipe should be threaded into place
as far as possible, and the cinch nuts should be tightened firmly to ensure
that the threads (especially in the cylinder head) do not become damaged
by vibration during flight.
Idle Stop Screw and Rotor Bolt
The idle stop screw adjusts the closure of the throttle barrel (idle speed).
We recommend adjusting the
idle stop screw to allow the
throttle barrel to close completely.
This will allow you to adjust the
idle speed via your transmitter,
therefore, you will need to set up
your transmitter throttle trim lever
to keep the engine at a low idle when the trim lever is centered, then to shut
off the engine when the trim lever is pulled all the way back. To adjust the idle
speed, loosen the idle stop screw
(turn counter-clockwise) to allow throttle
barrel to close more (reduce idle speed), or tighten the
idle stop screw (turn
clockwise) to make the throttle barrel stay open more (increase idle speed).
The idle stop screw is spring-loaded to hold it in place during flight.
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.
Needle Valve Extension - Optional
If an extension is required to adjust the high speed needle valve, use a
1.5mm diameter wire of the necessary length (not included). 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, then tighten the grub screw firmly.
Throttle Arm Position
The throttle arm angle can be adjusted to better suit your particular
application. Using an adjustable
wrench, loosen the throttle arm
retaining nut, then adjust the
angle of the throttle arm either
forward or backward. When
satisfied with the position, firmly
tighten the retaining nut.
Propeller Installation
WARNING
Before installing the propeller it must be 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.
2
Global Services
l
18480 Bandilier Circle
l
Fountain Valley, CA 92708
l
Phone: (714) 963-0329
l
Fax: (714) 964-6236
l
Email: [email protected]
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 breather nipple should be left as-is, however, a short piece of
fuel tubing can be attached to it and run outside of the cowl or fuselage to
prevent residual fuel oil from getting inside your model.
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 4" long. Never attempt to use the breather nipple as an
accessory pressure tap.
Fuel Tubing Connections
In most fuel tank assemblies, you will use a fuel pick-up tube and a pressure
tube. The fuel pick-up tube should be connected to the nipple on the carburetor
and the pressure tube should be connected to the nipple on the muffler.
