16
MOUNTING THE ENGINE TO THE FIREWALL
If using an engine equipped with a remote needle
valve we recommend mounting the needle valve
to the engine after installing the motor mount/engine
assembly to the firewall.
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5) The engine is mounted at a 90º angle in rela-
tion to the firewall. The motor mount beams should
be parallel with the bottom of the firewall. Using a
ruler and a pen, measure and draw a vertical center-
line on the firewall.
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6) Using a ruler and a pen, measure up from
the bottom of the firewall 1-1/2” and place two
marks. Draw a horizontal line at these two marks.
See photo # 27 below.
Photo # 27
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7) With your engine still installed on the mount-
ing beams, use a ruler and measure the width be-
tween the predrilled mounting holes in the motor
mount beams. This distance will vary depending on
the brand and size of the engine you have chosen.
See photo # 28 below.
Photo # 28
For 2 cycle engines only
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8) Divide the measurement found in step # 7
in half. Measure and mark this resulting distanceand
place marks above and below the horiztonal center-
line. Draw one horizontal line at the marks made
above and below the horizontal centerline.
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9) On the two horizontal lines you just drew,
measure and place two marks 5/8” to the left of the
vertical centerline and two marks 1-1/16” to the right
of the vertical centerline (looking at the firewall). See
photo # 29 below.
Photo # 29
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10) Hold the motor mount assembly up to the
firewall and double check that the four intersecting
lines line up with the four predrilled holes in the
mounting beams.
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11) Using a 7/32” drill bit, drill the four mount-
ing holes through the firewall for the four motor mount
beam screws.
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12) Mount the motor mount assembly to the
firewall using the four 4mm x 20mm machine
screws, four 4mm flat washers and four 4mm blind
nuts. Tighten the screws securely to draw the blind
nuts into the back of the firewall completely. See
photo # 30 below.
Photo # 30
MOUNTING THE ENGINE TO THE FIREWALL
For 4 cycle engines only
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13) The engine is mounted 180º down in rela-
tion to the firewall. The motor mount beams should
be parallel with the fuselage sides. Using a ruler and
a pen, measure and draw a vertical centerline on the
firewall.
Vertical
Centerline
Horizontal
Centerline
X
X = Distance
between beam
mounting holes