I use conversions because I'm cheap and I like the satisfaction of doing it myself. I like showing the DA, ZDZ, 3W guys that there is life outside the $800 engine.

"Yeppers!! Thats a chainsaw motor on there. Flies good, don't it?"

For hobby gassers I use Zenoah, Fox, and ZDZ. For conversions I've done Ryobi, Poulan, Craftsman, Stihl, and McCulloch. Amazingly, out of all the conversions I've done--my current Ryobi 31cc is the first turd I've ever built and been unhappy with. Not to worry--I got more jugs and pistons in the shop. I'll just swap out the top end on this one. Thats the benefit of having 7 cylinders and pistons lying around that you picked up at the garage sale for $10 apiece. Don't try that with a hobby engine.