the one pic of the engine on its side is ralphs conversion,if you do what he said that is what it would look like.if your lazy send it to ralph and it will look like it also.if ya want to do it cheap do it like my 24cc echo.magnet at tdc,sensor at 28 degrees btdc.i made my bracket in a way to adjust the timing if necesary.simplicity without rocket science.dont worry about hub diameter,anywhere from 1 to 2 inchs works perfect.