The problem is with a 2 stroke you lose half the combustion through the exhust which includes half the fuel/air mixture so for emmisions its not too feasable. Thats why they have expansion chambers and secondary power valving if you could figure a way to use that secondary gas for power and cleaner emmissions we could sell 2 stroke across the globe.
Joe
another thing I used to have a honda replica gp 500 2 stroke bike(kenny roberts) fast as hell and a cr250 dirt bike all the majors have moved to 4 stroke for emmisions? I now have a crf450 200cc more than the 250 thats all they race anymore? the 450 is fast but 450 2 stroke??? I think a cr 500 will beat it on the straight???