Great Planes 25% Pitts M-12S 50cc ARF - GPMA1421 User Manual

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12. Drill a 3/32" [2.4mm] hole directly below the bellcrank

arm. Cut 1" [25.4mm] of threads from the end of a 2-56x12"
[305mm] pushrod wire (Save this piece of thread to be used
in the next step). Make a 90° bend 1/4" [6.4mm] from the end
of one end of the wire. Slide the wire into the hole you drilled
and then install the bent end of the wire into the outer hole of
the other bellcrank arm. Secure it with a nylon FasLink.

This bellcrank allows you to access the choke mechanism
from the bottom of the fuselage using the wire you just
installed. The wire extends below the fuselage further than
what you might want. Later, after the cowl is completely
installed, cut the wire to the length you wish. You may also
want to make a bend in the wire to give you something to
easily grab onto for activating the choke.

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13. Cut the 24" [610mm] white ﬂ exible pushrod to a

length of 16" [406mm]. Thread the 1" [25.4mm] thread (that
you previously cut from the wire) into one end of the ﬂ exible
pushrod and screw a nylon ball link onto the end. From a
6" [152mm] 2-56 pushrod wire cut 1/2" [12.7mm] of the
thread off. Then, on the other end of the ﬂ exible pushrod,
screw the pushrod wire into it. Slide the pushrod into the tube
installed in the ﬁ rewall. Snap the ball link onto the ball on the
throttle arm.

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14. Install the throttle servo into the servo opening on the

left side of the fuselage with the hardware that came with
the servo. Trim three arms from a four-armed servo horn.
Enlarge the outer hole in the servo arm with a 5/64" [2mm]
drill bit. Center the servo arm and the throttle barrel. Make
a mark on the wire where it passes over the hole. Make a
90 degree bend on the mark. Secure the wire with a nylon
FasLink and then cut off the excess wire.