30
Test Fit the Cowl:
Reinstall the engine and slip the cowl back in place. Install the spin-
ner back plate and adjust the cowl to be about 1/16” back of the spinner
backplate. Observe the cowls position for proper alignment with the lines
of the fuselage.
Check the engine hole clearance. There should be about 3/32” to 1/8”
clearance all around the engine head.
Mark any areas where the hole needs to be enlarged. Remove the
cowl and enlarge the hole in the areas as needed. Do this iteratively, a
little bit at a time
to not error and make the hole too big.
Similarly measure and mark any other holes required:
1) Needle Valve and or extension
2) Muffler Ports
3) Fuel filling port, if used. (A fuel filling port is more than conven-
ient for filling the fuel tank, especially since you can not easily
get to the fuel tube inside the cowl.
4) Vent/Muffler tube
When satisfied, place a 1/16” scrap of balsa between the spinner
backplate the front of the cowl and slide the cowl up to the balsa spacers.
Mount the cowl with the four screws provided. Take time to mark the firewall
location and screw into the firewall where possible.
Install the muffler and vent/muffler silicon tube.
If you do not use a auxiliary fuel filler, route the fuel line from the tank
to the outside of the cowl, back into the cowl and then to the carburetor.
Allow about one (1”) inch between coming out of and going back into the
cowl to cut the tube and place in either a metal coupling tube of better yet
a fuel filter. This arrangement will provide for a inlet, fuel tank filling port.
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