My 2000 WR400 decided yesterday that it wasn't going to change gear any more. I stripped it down last night and found out why - there's a bit missing. See the peg on item 2 that goes into component 10 at http://parts.yamaha-motor.com/partimage.aspx?c=5,1649,1668&i=19905,2 well that's not there anymore. Anyone else heard of or had the same problem? The worrying thing is that I can't find the bit anywhere, although there was definately more swarf than usual in the oil filter, suggesting that it's just broken up. I was thinking of just replacing the part, running the engine gently for 10 minutes or so on some fresh oil, draining that out, refilling then back to normal use. What do you think?