I have only dealt with the 25cc (yes, 25cc :P) Poulan WeedEater leafblower motor. My first conversion to. Lee2Wings has much more experience than do I. He helped me convert mine. I do need to spin it for a while before it will fire. I use a Kavan starter. Others use Hobbico starts just fine though. I have been told that the chainsaw conversions start with one flip, but they have much much higher compression. The leafblower has very little compression to start. I have been told (and I have noticed from use) that the compression gets better and better as it is run in, and more power. This seems to be true. The Zama carb seems to be working fine for me, very hard to adjust with the casing around the needles. A buddy made a special tool for me to adjust mine. Lee2Wings slotted his with a dremel and that worked fine also.