Hi All'

Been flyin 2 strokes for about 2 years now and have just aquiered a couple of 4 strokes. I'm confused as to the power comparisons between the two type engines. Is there a chart or some formula you use to compare 2 and 4 stroke engines. For example: If I have a 2 stroke .61 and want to convert the plane to a 4 stroke, how do I know what size 4 stroke I will need. This just an example. What I would like is to have a complete comparison chart for future use.

Thanks
Tom