Gas Engine Installation - Horizon Hobby Pitts S-2B 50–60cc Manuel D'utilisation

128. Carefully remove the spinner cone and use a drill bit to make
a small indentation on the backplate for the mounting screws.
Remove the propeller and backplate. Use a drill press to drill
the holes in the spinner backplate for the propeller mounting
screws.

GAS ENGINE INSTALLATION

129. Use the lines around the holes in the fi rewall and template to
properly align the template. Use low-tack tape to secure the
engine mounting template on the fi rewall.
130. Use a drill and 1/4-inch (6.5mm) drill bit to drill the holes
in the fi rewall for the engine mounting screws. Remove the
template and tape from the fi rewall.
131. Remove the forward compartment cover from the fuselage
using a #2 Phillips screwdriver. Set the screws and cover
aside.
132. Use an M5 x 60 socket head cap screw, an M5 washer and
an aluminum standoff to draw the M5 blind nut into the back
of the fi rewall. Tighten the screw using an M4 hex wrench.
Install all four blind nuts. Remove the standoffs and screws.
Secure the blind nuts to the inside of the fi rewall using a
small amount of 30-minute epoxy. Make sure no epoxy enters
the threads of the blind nuts.
Pitts S-2B 50–60cc
133. Use the four M5 x 60 socket head cap screws, four M5
washers and four aluminum standoffs to attach the engine to
the fi rewall. Make sure to use thread lock on all the screws to
prevent them from vibrating loose.
134. Slide a silicone clevis retainer on the metal clevis. Thread the
clevis on the longer throttle pushrod.
135. Drill a hole in the fi rewall that aligns with the carburetor arm.
Slide the pushrod wire though the hole and into the fuselage,
Attach the clevis to the carburetor arm and slide the retainer
over the forks of the clevis.
 Use the instructions included with the engine for details
regarding the installation of the carburetor arm.
136. Install the throttle servo in the throttle servo mount.
Center the servo and place the servo arm so the arms are
perpendicular to the servo centerline.
19 EN