Jip, still under warranty. I will visit the dealer on Saturday. Curious what it is.

mmmm
 

doesn't sound healthy does it....

(that is an official diagnosis)

will she make it... http://img151.imageshack.us/img151/1...nicyj81uh9.gif

doctor ???

Ouch - sounds very poorly.. Could be a combination of all sorts of sloppy mechanical bits..

I've got my bike back. It was the nut of the crackshaft. It is a known problem for the older XTZ 660's and also on some 600. A pitty Yamaha did not find a solution.

Which side?

Hi Neik, I assume you mean the clutch basket/primary gear nut? Just did a quick google on it - something else to watch out for!

Cheers,
Rick

I know about the clutch hub nut coming loose, but have never heard of the crank nut coming loose on a XT before.

I assume it's the nut that holds the magneto/flywheel in place.

http://home.planet.nl/~scho3025/Tene...tchMagneto.jpg

I remember in my early days of (low budget) motorcycling I had an similar experience when I didn't put things together properly after replacing a faulty AC-generator on my worn Honda CB400N. After 40km's the engine started to sound and feel like it would fall apart.... flywheel had come loose...

HJ

I think it was the nut holding the balancer drive gear, have to check it at home.

Found it, lock washer 90215-20X00 has been replaced which is from the nut on the right side of the primary drive. figure 16 part no 4 of the parts list.
http://i53.tinypic.com/9vcahu.jpg