I have converted severial wacker type engines for RC airplane use. I use C&H ignitions, and have execelent results with them. You can also buy the prop adapter and the mounting plantes from them. They also sell the twist intake manafold, which is a must with the Momelite engines. If you look long enough, you can find Homelite wacker engines for free. Most are 25 CC. You can buy a cylinder and piston kit to up that to 30 CC. Although these engines are low output, with low compresion ratioes, they respond well to a little port work. Mainly the exaust port. In stock form, they don`t breath well. The factory builds this into them for safety reasons. Most will run all day wideopen, with no load, and not blow up. Raise the exaust port 1/4", install a bigger carburator, and a desent free flowing muffler, and that all changes. Set the ignition timing at 28 deg advanced, thats plenty. Mine will pull a thined down 20 X 6 wood prop at 7600 RPM. With a tuned exaust and a 18 X 10, 8300 RPM. I have been flying this engin for two years now with no problems.
Cropduster48