Hello have an Aprilia RS 50 Extrema Bj. 97 The problem is that it stutters in the high speed ranges. In addition, it jumps badly. Now I have already changed the stator (light mesh), ignition unit, cylinder seals and ZK and carburettor cleaned. Naturally everything you can change. Do you still happen to know if it can be something else ? or is the stator I have bought new defective ? (comes from france) Thank you in advance in greeting Martin P.S. Zündzeitp I also tried to set unkt