14
❏
3. Use a marker to mark the position for the throttle pushrod
as shown on the fi rewall pictured. Use a 13/64” drill bit to drill
through the fi rewall. Be careful not to drill into the fuel tank.
❏
4. Use a propeller reamer or correctly sized drill to enlarge
the hole in your propeller and in the spinner backplate to
fi t your engine. Place the backplate of the spinner on the
engine and position the engine on the mount so there will be
a maximum 1/8" [3mm] space between the backplate of the
spinner and the front of the fuselage.
Note:
Most 4-stroke
engines will not be able to be positioned far enough aft on
the mount to achieve this spacing, so just move the engine
as far back as possible.
❏
5. Use a Great Planes Dead Center
™
Hole Locator
(GPMR8130) or a sharpened wire to mark the location of
the engine mounting holes onto the mount.
❏
6. Drill #29 (or 9/64" [3.6mm]) holes through the engine
mount at the marks you made for the mounting screws. Mount
the engine with four 6-32 x 3/4" [19mm] machine screws and
#6 lock washers. Use an 6-32 tap to tap threads into the holes
after drilling them. Then, use 6-32 x 3/4" machine screws and
#6 lock washers for mounting the engine.
Note:
Four-stroke
engines may have to be temporarily dismounted later while
hooking up the throttle.
❏
7. Some engines may need to have clearance for the needle
valve. Cut clearance in the fuselage as needed for your engine.
