22
Now it’s time to fi nalize the engine cutout and
make the cutout for the muffl er.
❏ ❏ 21. Mount the muffl er to the engine. Repeat
the cut-and-fi t procedure to cut out the cowl for the
muffl er. Proceed slowly, cutting a little at a time and
test fi tting the cowl often as you proceed.
❏ ❏ 22. Now that the cowl has been rough-cut to
fi t around the engine and muffl er, use a rotary tool
with a sanding drum to make any fi nal cuts so there
will be adequate clearance around the engine and
muffl er and so the cutouts look good with smooth
lines, straight edges and nicely-rounded corners. You
can also make additional cutouts for cooling air where
necessary. Final-sand all the openings with 320-grit
or 400-grit sandpaper.
❏ ❏ 23. Cut any other holes necessary for the needle
valve, low-speed needle adjustment screw, glow plug
igniter, fuel fi lling, etc.
❏ ❏ 24. To duplicate the fueling system shown in this
manual, make a fuel line mount for the fuel fi lling line
from a balsa block (not supplied) and a 9/32" [7mm]
O.D. K+S brass tube. Sharpen the end of the tube,
and then use it to cut a hole through the balsa block.
Round the top of the block to fi t the inside of the cowl.
Glue a 1/4" [6mm] piece of the brass tube into the
balsa block so it sticks out the rounded side of the
block 1/32" [.5mm].
❏ ❏ 25. Cut a 9/32" [7mm] hole in the cowl where you
want the fueling line to come out. Use epoxy mixed
with microballoons to glue the block into position.
❏ ❏ 26. Connect 8" [200mm] of silicone fuel tubing
(not included) to the fi ll line coming from the fuel tank.
When mounting the cowl later, guide the fi lling line
through the brass tube in the cowl. After fueling the
model at the fi eld, close the line with an aluminum
fuel line plug. Then, push the line back into the tube.
❏ 27. Mount the right cowl the same way.
MOUNT THE REPLICA ENGINE
❏ ❏ 1. Sand all the way around the edge of one of the
replica engines so glue will adhere. Sand the inside of
the cowl where the engine will be glued as well.
❏ ❏ 2. Use curved-tip plastic-cutting scissors or your
rotary tool to cut out two cylinders of the replica engine.
❏ ❏ 3. Carefully twist a hobby knife into the plastic
making small holes for the wire replica pushrods. Fit
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