I posed the same question here a few years ago, before I did my gx200 buildup. I didnt get a good definitive answer, but I went ahead with my plan anyway. I was surprised to pull and realize the starting effort was no differant then a stock engine or maybe even easier! One thing I noticed was the nub for the release was a bit more taller than the stock cam, so that is a factor. I thought about taking a stone to it, but after figuring out a start proceedure i left it alone, it starts really easy. My specs NR .280 cam, +.010 rod, .035" off a 18cc head, flattop piston, .009" head gasket I figure its about 11.1 comp. ratio. The high compression will help you with that midrange.