I have both a 250cc in a single seat buggy and a 150 in a single seat buggy. The 250 weighs about 100 more pounds than the 150. The 250 has a big bore, ported head and high lift cam. It will top out at 36 mph in 300ft and 44 mph over a longer run.. My 150 which I have a 6mm stroke, 63mm bore and a custom cam with 34mm Mikuni carb will do 49mph in 300ft and top out at 50+ over a long haul. However I do have the 3:08 final drive gearing, not sure what the CN 250 has for gearing. Never bothered to check since there is no other gearing available that I have found for the 250. The 150 at 50+ mph is running at 9300 rpm. If I were to put a 274 final drive gear in it my top speed would substantially increase due to the rpm's being lower. I just think for the money spent on a 250 than to fabricate it in chassis than mod, the 150 can be done for slightly more money less labor and the results being much greater.
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