With my stint as editor of the Sympo done, I got to read all the articles stem to stern and one of the engine articles by Ron Bennet spoke about using a Habor Freight Ultrasonic cleaner. I had used these before (an industrial style as well as another inexpensive version) and thought I would give the HF version a try, as it was about 30 bucks or so.
I picked one up along with the soap solution and I am here to say that it does work! I have an OS Max 40 converted to a .36 for sports racing and it was a bit crudded up. I tore it apart and found alot of burnt castor in the bearing and other places. Mixed the solution and fired it up. After a few tries it got out 95% or better of the goop.
Needless to say I am pleased with the results. If you want something to clean engines and possibly timers, give it a try. The model number is 03305….