RE: Biplane Advanture
That ZDZ 40cc F3A is a US mod and not factury.
Its only a slightly lightened version of the standard engine. Apart from that, it has nothing repeat nothing that warents that "F3A" branding.
Why buy a 4000 buck pluss Sate of the Art beauty and strap on a cheap and simple, great big thumping gasser with no decent soft mount or even a well sorted pipe?
What do you achieve?