Great Planes Edge 540 1.60-43cc Performance Series ARF - GPMA1414 - Manual (Page 19)

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o 3. Use a 7/32" [5.6mm] bit to drill holes at the four marks
you made on the firewall. To reduce tear-out, make pilot
holes with a smaller bit first, then finish the holes with the
7/32" [5.6mm] bit. Insert a 8-32 blind nut into the back of
each hole. Use a 8-32 x 1-1/4" [32mm] SHCS and a few #8
flat washers to draw the blind nuts tight against the back of
the firewall.
o 4. Loosely install the 1.20 to 1.80 nylon engine mount
to the firewall using four 8-32 x 1-1/4" [32mm] SHCS, four
#8 flat washers, four #8 lock washers and threadlocking
compound. The engine mount should be oriented so that the
engine head will be on the right side of the plane.
o 5. Fit the engine onto the mount and slide the engine mount
halves together against the engine crankcase. Remove the
engine and tighten the engine mount screws. Reposition the
engine onto the mount so that the front of the drive washer is
6-3/4" [171mm] from the firewall.
o 6. Use a Great Planes Dead Center ™ Hole Locator or a
small drill bit to mark the engine mounting holes onto the
engine mount.
o 7. Drill 9/64" [3.6mm] holes at the marks you made and
thread the holes using a 8-32 tap and handle. Install the
engine onto the mount using four 8-32 x 1" [25mm] SHCS,
four #8 flat washers and four #8 lock washers.