RE: RC Nitro Motorcycle Frames / Kits
I've only seen one Kyosho converted to nitro. At 1/8 scale, they are just too small for most folks to convert from electric.
If you want nitro, just get one of the 1/5 scale nitro kit bikes. Check out the Nuova Faor SF501 (or new 506) or the Thunder Tiger Duc999r. Much easier to go with nitro to begin with, than to convert, although it's certainly been done.
The 1/5 scale bikes give much better performance also.
HTH
STeve in NC