Fuel injection, by it self, does not decrease pollution or reduce fuel consumption. It is the control system that does it, by closely monitoring the engine; heat, pressures, intake and exhaust gases and controlling fuel delivery using complicated mathematical formulas. Therefore, to work properly, the control system needs to be designed for your engine. The most effective way to decrease pollution, from your engine, would be to fit catalytic converter on your exhaust.The simplest solution, after the catalytic converter, would be to buy a different, better, carburetor and premix the 2 stroke oil. Like from tct.is or other aftermarket carburetor manufacturers. Tct claims to reduce pollution, most others claim to increase power. Or you could convert it to gas for much lower pollution (LPG) http://www.bikestaff.com/gassino.html (in Italian) They should have kits available.