Great Planes Yak-54 1.60 ARF - GPMA1411 - Manual (Page 22)

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1. Cut the mounting bolt template for the Fuji-Imvac
BT-43 EI Gas Engine from the rear of this manual and tape it
to the firewall. Align the vertical and horizontal lines as shown.
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2. Mark the hole centers with a pin and drill 3/32"
[2.5 mm] pilot holes at the cross marks for the bolt holes.
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3. Remove the template and enlarge the holes using a
1/4" [6 mm] drill bit.
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4. Install 10-32 blind nuts (not included) into the rear of
the firewall using epoxy. Thread a 10-32 bolt with a washer
into each blind nut to draw them tight against the firewall.
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5. Mount the engine inverted to the firewall using 10-32 x
1-1/4" [32 mm] bolts, #10 flat washers and #10 lock washers
(not included). If the neck of the blind nuts you are using protrude
from the front of the firewall, install #10 washers (not included)
in between the engine and firewall over the blind nuts. The face
of the prop hub will be approximately 6-3/4" [171 mm] when
installing the Fuji-Imvac BT-43 EI engine. Other brand engines
may vary slightly in length. The acceptable range is 6-3/4" to
7-1/4" [171 to 184 mm] (this distance will automatically be
adjusted for when using the cowl ring).
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6. Mount the ignition unit and gas ignition kill switch
following the guidelines from the shaded box on the bottom
right-hand column on page 21 and following your engine
manufacturer’s instructions. There is space available behind
the firewall.
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7. Remove the stopper from the included fuel tank and
replace it with a gas safe stopper as mentioned above.
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8. Assemble the stopper using Du-Bro #813 1/8" [3.2 mm]
I.D. fuel line barbs and 1/8" [3.2 mm] brass tubing as shown.
Solder the barbs to the brass tubing but be careful not to
overheat the assembly as it could cause damage to the
rubber stopper. See the
Expert Tip that follows.
B. Solder a Du-Bro fuel line barb onto one end of each of
the three tubes (be sure that the barbs are positioned on
the tubes so that they will secure the fuel tubing when
fitted in place). Slide the barbs in place and apply a small
amount of solder to the joints between the barbs and the
tubes. Solder will wick into the joints securing them in
place. Be careful not to use too much solder as it could
obstruct fuel flow inside the tubes.
Note: The item used in the picture above to hold the tubes
is the X-Acto Extra Hands Double Clip (XACR4214).
A. Cut one of the two brass tubes included with the Sullivan
conversion kit in half (approximately 1-3/4" [45 mm] pieces).
Prepare the tubes for solder by scuffing up the ends with
sandpaper and cleaning them with alcohol.
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