Top Flite TOPA0970 - Manual (Page 20)

20
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6. Position the front of the engine drive washer
5-7/8" [149mm] from the fi rewall. Mark the location of
the engine mount holes onto the mount rails using a
Dead Center hole locator. Remove the engine from
the mount and use an 8-32 tap and drill set to create
threads in the four mounting holes. Attach the engine
to the mount using four 8-32 x 3/4" [19mm] SHCS, four
#8 fl at washers, and four #8 lock washers.
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7. Install your muffl er onto the engine. We used an
optional 90° header (OSMG2624) to route the muffl er
pipe entirely within the cowl. If you choose to only use
the header included with the engine, the muffl er will
exit on the side of the plane and some of the cowl will
need to be cut away. If you have installed a 2-stroke
engine, we recommend using an optional in-cowl
muffl er. The stock muffl er can also be used; however,
the muffl er will exit on the side of the plane. Cut
the vent line and carb line to the correct length and
connect them to the engine. Leave the fi ll line uncut.
INSTALL THE RADIO SYSTEM
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1. Install your throttle servo in the throttle servo
tray on the same side of the fuselage as the throttle
arm on the carburetor.
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2. Cut three arms from a four-armed servo arm.
Install a brass screw-lock connector into the third hole
from the center of the remaining arm using a nylon
retainer. Loosely thread a 4-40 x 1/8" [3mm] SHCS
into the screw-lock connector. Use your radio system
to center the servo and attach the arm perpendicular
to the servo case pointing away from the center of the
fuselage. Be sure to install the servo arm screw. Install
a screw-lock connector with a 4-40 x 1/8" [3mm] SHCS
into the throttle arm on the carb. Cut the threads off of
the 17-1/2" [445mm] 2-56 pushrod. Slide the pushrod
through the outer pushrod tube as shown. Make any
necessary bends in the pushrod to connect it to the
throttle arm. With the throttle servo centered and the
carb at 1/2 throttle, insert the pushrod ends into the