So I just got done installing the top end in a 2000 RM125. Went fairly smoothly only took an hour or so, then had to rip it back apart to put the dowel on I forgot the first time. It runs SOOO much better, I haven't gotten on it hard yet since I'm waiting for it to break in, but there is a power band, it sounds normal, and feels great. This was my first top end job so I don't know what it feels like to ride one with a brand new one just installed and not broken in. It is my buddies bike and I did it for him. It sounds really pingy, but I think that is the muffler packing since there is hardly any in there at the moment. Also, the first time I fired it up it idled perfect, then when you ride it and come to a stop, it'll die on you even with the idle screw pretty far in. Is this normal on new top ends? Other then the idling problem all is good, I hope!