Model Tech SE5a SCOUT Instructions For Final Assembly page 21

STEP 3: INSTALLING THE THROTTLE PUSHROD & ADJUSTABLE CONNECTOR
IMPORTANT INFORMATION ABOUT THROTTLE PUSHROD SETUP FOR FOUR-STROKE ENGINES
The hole in the firewall for the throttle pushrod wire has been predrilled from the factory. This hole is positioned to line up
with the throttle arm on most .40 - .52 size two-stroke engines. If you are using a four-stroke engine, the hole will likely
not line up with your engine's throttle arm. This was the case with the Magnum XL .52RFS four-stroke engine we
installed. In our case, we drilled a new hole approximately 1" above the predrilled hole, then fashioned a throttle arm
stand-off lever from a machine screw, a couple of nuts and washers and a spare servo arm. This allows the throttle arm
to line up properly, without having to make any large bends in the throttle pushrod wire. You could also opt to use a
ready-made, four-stroke throttle bellcrank (available from your local hobby shop) to achieve the same result.
Using a modeling knife, cut away all but one arm from a "4-point" servo horn.
PRO TIP
To prevent the connector nut from loosening during flight, apply a drop of thin C/A to it. Allow the C/A to dry
before proceeding.
Remove the throttle arm from your engine and install the
Z-Bend in the pushrod wire into the outermost hole in the
throttle arm.
You may need to enlarge the hole in your engine's throttle
arm, using a 5/64" diameter drill bit, to accommodate the wire.
IMPORTANT Shown is the throttle arm stand-off we made
for our four-stroke engine from the materials described above.
Slide the plain end of the throttle pushrod wire through the
hole in the firewall.
Reinstall the throttle arm onto your engine.
IMPORTANT The pushrod wire should line up closely,
but you may still need to make a slight bend in the pushrod
wire so that it doesn't bind.
Enlarge the hole in the servo arm that is 9/16" out from the
center of the servo arm, using a 5/64" diameter drill bit.
Install the adjustable servo connector into the enlarged hole.
IMPORTANT When threading on the connector nut, don't
tighten the nut completely. You don't want the connector
loose, but you do want the adjustable connector to be able
to rotate without binding.
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