firewall. Visually line-up the throttle arm, at the point where it will
be driven by the throttle pushrod, straight back to the firewall. Use
a pencil to mark this location on the firewall.
The throttle tube hole is easier to drill with the engine out of the
way, so remove it from the mounts. Use a power drill with a 13/64"
dia. bit to drill the hole through the firewall. From the kit contents,
locate the Throttle Linkage bag.
Remove the 5mm x 19-3/4"
female throttle tube and the 3.4mm x 23-1/2" inner nylon throttle
pushrod. The outer tube must now be inserted into the fuselage,
through the hole in the firewall. It is then fed through the second
pre-drilled hole in the first former, through the pre-drilled hole in the
second tilted cabin former and finally, through the pre-drilled hole
in the third cabin former and into the servo bay. These holes have
been pre-drilled on both sides of the fuselage formers to
accommodate different engines and carburetors.
To make this fairly easy, first feed the inner nylon throttle pushrod
through these same holes, beginning in the servo bay. Feed the
pushrod through each hole, reaching into the fuselage with your
hand, guiding the pushrod through each hole. When the pushrod
emerges from the firewall, slide the outer pushrod tube over it and
begin feeding the tube back through the same holes.
As you
proceed, twist the tube with your fingers, helping it to center itself
and pass through. When the end of the tube is into the servo bay,
it's in place. Remove the inner pushrod tube.
❑
13) Four-stroke engines all have crankcase breather fittings.
Our Saito has this nipple fitting in the rear of the crankcase. Attach
a 7" or so length of fuel tubing to this fitting. Using your mounting
hardware, mount the engine - with the muffler and manifold firmly
in place - permanently to the motor mount arms.
The inner throttle pushrod is now prepared for connection to the
engine throttle arm. From the Throttle Linkage bag, locate one of
the R/C links with an M2 x 22m stud threaded in place. Unthread
the stud from the R/C link. The stud is now threaded into one end
of the inner nylon throttle pushrod. A neat way to do this is to use
an electric drill. Lightly chuck the stud about halfway into the drill
and holding the nylon pushrod firmly, thread the stud in place with
the drill - simple, neat, and quick!
Thread the R/C link onto the end of the stud and insert the other
end of the pushrod into the tube in the firewall. The connection can
now be made to the throttle arm. The throttle arm location on our
Saito was fairly close to the firewall which caused our linkage to be
slightly too long. We solved this by cutting off a little (3/32" or so)
of the threaded barrel at the rear of the R/C link, using a carbide
cut off wheel. Leave the pushrod connected to the engine for now.
❑
14) The assembled fuel tank is now installed.
From the kit
contents locate the Miscellaneous Wood Parts bag. For this step
you will need the die-cut 1/8" lite-ply Rear Fuel Tank Former and
the 5/16" x 3/4" x 5" balsa fuel tank retainer, as well as the fuel
tank. In addition, have your fuel tubing ready and some silicon
sealer.
Cut two 8" or so lengths of fuel tubing and place one length onto
each of the two fuel tank lines. Fish a length of string through the
round fuel tank hole in the firewall, through the tank compartment
and into the cabin area. The string will be used to direct the tank
and fuel tubing into the tank compartment. Tie the end of the
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