Thanks. That is the information I have been looking for.
Recently I have been going back to engines I have built in the past and refining them. I have a tendency to build an engine, get it to run and then move on to the next project. Recently I have been taking past engines and improving the carburetor (C Fellows) and I am now moving on to ignition. This is partly to get a better running engine and partly to get an engine someone else can use. I have been using an ignition box consisting of a 6 volt gel battery, and automotive coil and condenser. I can move this box from engine to engine but as I get older I realize that at some point either my kids or me will want to sell or dispose of these engines so I am looking for a permanent system for each engine. Transistor ignition systems can be pretty inexpensive if you build your own. In the past I have used complete ignition system from S/S and others but these are more expensive. So I am just playing around and experimenting at this point.
Gordon