20
Hangar 9 Christen Eagle II 90 ARF
4-Stroke Engine Installation
Required Parts
Fuselage assembly
Engine mount (right and left)
M4 washer (12)
M4 blind nut (4)
M4 lock nut (4)
M4 x 30 machine screw (8)
Engine
1. Locate the items for this section of the manual.
2. Use low-tack tape to secure the plywood engine
template to the firewall, making sure it is centered. Use a
drill and 1/16-inch (1.5mm) drill bit to drill the four pilot
holes for the wood box mounting screws.
3. Remove the template from the fuselage. Use a 7/32-
inch (5.5mm) drill bit to enlarge the holes in the firewall.
4. Use a ruler to measure up 2 inches (51mm) and over
1
3
/
16
inches (30mm). Use a drill and 5/32-inch (4mm) drill bit
to drill the hole for the throttle pushrod.
5. Attach the right and left engine mounts to the firewall
using four M4 x 30 machine screws, four M4 washers and
four M4 blind nuts. Note the position of the mounts as
shown in the photo with the rails toward the left side of the
fuselage. Use a #2 Phillips screwdriver to tighten the bolts,
drawing the prongs from the blind nuts into the back-side
of the firewall. Make sure to use threadlock on the bolts to
prevent them from vibrating loose.
6. Check the position of the carburetor on your engine.
It may be necessary to turn the carburetor around to match
the position shown. Follow the instructions provided with the
engine for the correct procedure if necessary.
