Top Flite TOPA0955 - Manual (Page 22)

22
FINISH THE MODEL
INSTALL THE COWL & DUMMY ENGINE
Before installing the cowl you must give some
consideration to the mufflers . If you have installed
a two-stroke engine you will need to cut a lot of the
cowl for the standard muffler . A “Pitts” style muffler
will help minimize the amount of the cowl you will
need to cut . The four-stroke muffler fits pretty well
but a better fit can be achieved if you utilize the
additional exhaust header that will be mentioned .
We are showing the installation of the O .S . .91 four-
stroke engine . Modify the instructions as needed to
fit your particular engine .
o 1 . Cut away the portion of the dummy engine that
will be in front of the engine cylinder . This is needed
for proper cooling of the engine . When determining
the exact location to cut, note that the cylinders
should be oriented as shown in the picture . We were
able to cool the O .S . .91 by only cutting away a small
portion of the vacuum formed engine as shown in
the picture .
o 2 . Drill 1/8" [3mm] holes into each of the cylinder
heads and at the base of the cylinder as shown .
o 3 . Install one of the 1/8" aluminum tubes into
each of the sets of holes . Apply a drop of glue on
the backside of the dummy engine where the tube
contacts the plastic to keep them in place .
o 4 . Cut the 12" [305mm] red wire into nine 1-3/8"
[35mm] lengths .
o 5 . Drill a 1/16" [1 .6mm] hole into the cylinder and
at the base of the cylinder . Install a red wire into the
holes to replicate the spark plug lead . Secure the
wire with glue on the back side of the dummy engine
in the same way it was done for the tubes .