This post has nothing to do with KTM . But I hope someone can help. I bought an 03 RM 250. It didnt quite run right when I bought it. Seemed jetted too heavy. I put an FMF Fatty Pipe, Power Core 2 Silencer, Twin Air Filter, new plug, V-Force 3 Reeds, and rejetted. The plug looks good after some idling and wide open runs. It still doesnt seem to open up all the way. Does anyone have any opinions on what might be wrong. Thanks.