people always try to say purpose built engines work best but if you go to http://www.bcmaengines.com/ which has converted engines you will see that its not always true. the 46 poulan with EI would work beautiful on that aircraft. i am working on converting homelite 25cc engines for use on a 72 inch 120 cap. just something i want to do for fun. i am not a 3d pilot and wont go for competitions so why bother with an expensive purpose built.

edit: in this hobby i have learned there are alot of naysayers that are aparently experts and have done everything. but most havent tried conversions for themselves or will ever try based on what they were told by someone else.