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❑ Install the throttle servo into the forward hole in the plywood servo
tray, making sure to drill 1/16" diameter pilot holes for the mounting screws.
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✦✦
✦IMPORTANT
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✦ The servo output shaft should be toward the front
of the fuselage, as shown.
STEP 2: INSTALLING THE THROTTLE PUSHROD WIRE
✦✦
✦✦
✦IMPORTANT
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✦✦
✦ Since we are using a four-stroke engine in our model, attaching the throttle pushrod wire to the engine's throttle
arm can be more tricky than if we were using a two-stroke engine. This is because the carburetor on most four-stroke engines is
on the back of the engine, close to the firewall. To make connecting the throttle pushrod wire easier, we made a 180º bend in the
end of the throttle pushrod wire. This allows the Z-Bend to be connected to the throttle arm without causing the pushrod wire to
bind. This also ensures that the throttle pushrod wire will not interfere with the installation of the fuel tank assembly. Installing the
throttle pushrod wire will be the same if you are using a two-stroke engine. The only difference will be that you will only need to
make a slight bend in the pushrod wire to line up with your engine's throttle arm.
✦✦
✦✦
✦IMPORTANT
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✦✦
✦ If you're using a two-stroke engine, don't make a 180º bend in the pushrod wire as shown in the next procedure.
❑ Using a pair of pliers, carefully make a shallow 180º bend in the
pushrod wire.
❑ Slide the plain end of the pushrod wire into the predrilled hole in
the firewall, then reinstall the throttle arm onto your engine.
❑ Double-check that the pushrod wire does not bind. The carburetor
barrel should open and close smoothly and completely. You may need
to make a couple of bends in the pushrod wire, so that the pushrod
assembly will operate smoothly.
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If you're using a four-stroke engine, you will need to make a bend in
the pushrod wire where it exits the firewall, so that the pushrod wire will
line up with your engine's throttle arm.
❑ Using a modeling knife, cut away all but one arm from a "4-point" servo horn.
STEP 3: INSTALLING THE ADJUSTABLE PUSHROD CONNECTOR
Continued On Next Page
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❑ Remove the throttle arm from your engine and install the Z-Bend in the pushrod wire into the outermost hole in the throttle arm.
☞
You may need to enlarge the hole in your engine's throttle arm, using a 5/64" diameter drill bit, to accommodate the pushrod wire.
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