RE: Engine Conversion
Rustler555
Check the Engines Forum. There is a forum specifically for information on engine conversions. I have converted a Homelite 25cc and been flying it for about 7 years. Most recently, I have converted a McCulloch 28cc engine which will go into a Balsa USA Sopwith Pup (1/4 scale) to be built this year. There are numerous conversions of trimmer and chain saw engines. Visit that forum for lots of information.
(edit for spelling)