The bike is a 99 RM 125. It recently started doing this thing that when you start out in neutral and hold the clutch in and shift into first gear it lurches forward and stalls out. After doing a search on this I see that a band-aid fix is to file out the grooves that have been worn into the clutch basket.(assuming that this is the actual problem) Does one need any special tools to remove the basket? Or is there another potential problem I've overlooked here?