The first part is flat out wrong. KTM makes their EXc, XC, XC and whatever other variations there are and Aprilla makes a 125 two stroke road racer, RS125 which is Legal for road use in (In Aus anyway). Yamaha hasn't lead any two stroke revolution, they've pumped out the same bike since 06 while KTM's two stroke lines, offroad and motocross have been selling like hotcakes. KTM is the manufacturer that is consistently changing the bike and usually for better.