look around on ebay for a deal on a conversion, I would agree with RCpilot in that you definately need upwards of 40cc. I flew my ultrastick today (Stihl 27cc that KEN LAMBERT did for me well over a year ago) and she still screams[>:] I switched props from a 16x8 to a 15x8 and it seemed to really open up some. At about 13 lbs I think it could still lose some weight but this thing is so damn fun to fly! Ken also converted a 65cc 4stroke Stihl backpack for me thats going in a 30% EDGE. I'll post pics when I get the engine mounted.

one question, What size props are you guys running in the 25-31cc range? 18x6 proved to be too much, 16x8 was good, 15x8 was better response and pretty fast too!! I like flying 3d but with the weight of this plane its better just fun flying so I was thinking about putting something like a 14x12 and making it really hall a**!

it seems I'm also limited by a governor in my ignition coil[:@] any suggestions here? C and H? how much?

Thanks guys and happy flying