Great Planes P-51 Mustang GP/EP ARF - GPMA1205 - Manual (Page 13)

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6. Position the front of the engine drive washer 4-5/8"
[117mm] from the front of 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 a
6-32 tap and drill set to create threads in the four mounting
holes. Attach the engine to the mount using four 6-32 x 3/4"
[19mm] screws, four #6 fl at washers and four #6 lock washers.
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7. Install your muffl er onto the engine.
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8. Cut the fuel tubing coming from the tank to the proper
length and connect the pressure and carb lines to the engine.
The fi ll line (if installed) should be plugged with the included
fuel line plug and can be routed through a hole in the cowl
which will be done later in the assembly (remember to replace
the fuel line plug after fi lling or draining the fuel tank).
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9. Cut three arms from a four-armed servo arm included with
your throttle servo. Center the servo with your radio system
(50% throttle) and install the arm perpendicular to the servo
case. Install a screw-lock pushrod connector into the second
outer hole in the remaining arm and secure it in place with a
nylon screw-lock connector retainer. Loosely install a 3x4mm
set screw into the screw-lock pushrod connector. Cut off the
tip of the servo arm beyond the screw-lock connector.