Muffler on engine.
made from stuff sitting around. The inner tubes are cut from a
length of heavy wall tubing. The outer shell is part of a
deceased satellite dish mount. The size and number of holes in
the inlet and outlet pipes was figured to have slightly more combined
area than the exhaust port on the engine. It was a matter of
picking a drill size, figuring the area of the holes it made then
dividing that number into the area of the port. 24 number 15
drill holes was about right so that's what I went with. Once I've
run it long enough to cook the paint, I will wire-off what is left and
repaint with grill paint.
Oh, yes - in the right-hand photo
above, you can see my variable speed modification just below the
governor. The lever pulls on a spring that takes the place of the
concentric spring that used to be on the governor shaft. I still
have to pick a prpoer spring because, with what is on there now,
there isn't a lot of speed change, from about 600 RPM to a little over
Incidentally, the engine seemed to run happiest today
at about 800 RPM. After running another tank of fuel through it,
the temperature was about 240F.