Model Tech Fun Fighters P-51 ARF Assembly Instructions Manual page 21

❑ Remove the throttle arm from your engine and install the Z-Bend in the pushrod wire into the outermost hole in the throttle arm.
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You may need to enlarge the hole in your engine's throttle arm, using a 5/64" (2mm) diameter drill bit, to accommodate the
pushrod wire.
STEP 3: INSTALLINg THE ADjUSTABLE PUSHROD CONNECTOR
❑ Connect your radio system and check that the throttle servo output shaft is rotating in the correct direction, then position the throttle
control stick and the throttle trim lever to their lowest positions.
IMPORTANT You will need to cut a shallow relief in the edge of the forward bulkhead for the throttle pushrod wire. This will
ensure that pushrod wire doesn't bind and that the fuel tank won't interfere with the pushrod wire when it's installed later.
❑ Drill a 1/8" (3mm) diameter hole through the firewall for the pushrod wire.
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We suggest that you remove the engine and motor mounting beams to
make it easier to drill the hole accurately.
❑ Slide the pushrod wire through the hole in the firewall, then reinstall the
throttle arm onto your engine. You will probably need to make two bends
in the pushrod wire so that it will line up with the throttle arm and prevent
binding.
❑ Open and close the carburetor several times to ensure that the pushrod
wire does not bind.
❑ Cut away all but one arm from a "4-point" servo horn, then enlarge the
hole in the servo arm that is 3/4" (19mm) out from the center of the servo
horn, using a 5/64" (2mm) diameter drill bit.
IMPORTANT The adjustable pushrod connector needs to be installed
no less that 3/4" (19mm) out from the center of the servo horn so that the
pushrod is as near the fuselage side as possible. This will ensure that the
aileron servo horn won't interfere with the adjustable pushrod connector
when the wing is mounted.
❑ Install the adjustable pushrod connector onto the servo arm, making sure
not to tighten the nut too tightly. You don't want the pushrod connector loose,
but it should be able to rotate without binding.
IMPORTANT To prevent the nut from loosening during flight, apply a
drop of thin C/A to it. Allow the C/A to fully cure before proceeding.
❑ Slide the adjustable pushrod connector assembly onto the pushrod wire,
then install the servo horn onto the servo, making sure that it's angled
approximately 30 degrees from center.
❑ While holding the carburetor fully closed, install and tighten the machine
screw in the adjustable pushrod connector.
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