A KT100 on gas, with pipe, ~18hp. KA100 - ~21 hp. 100cc ICA - 23hp. 125 tag - 28 hp, 125 sudam gas ~30hp, 125 shifter ~34 hp, add 10% for alky to the previous.... Most CR250 types don't add much hp, but add a lot of torque....mid 40's hp. Get a peaky pipe, gut trans, convert to 270 micro style with methanol, perhaps 70-80. And quicker spinup than stockers, for sure. But for 80hp, you'd need the displacement, and a quick rev, and probably power adders. At say, 270cc 2-stroke, 80hp is 296hp/L High, but achievable.