crankshaft bearings
 

hi
what u think can cause that?
video - https://www.youtube.com/watch?v=f1RJGRqn640
tenere xt660z 2011 with 74.000 km 100% on road. last 50.000 km with me.
oil was good. Checked 2 days ago.
on a short trip of 30 km to home i heard this Terrible metalic noise.
went straight to the workshop so they can check it out.
results in video.
thanks

Unfortunately YouTube says the video is private so can't watch it...

should b public now

I’ve not seen or heard of the two cage halves separating on XT660 motors before. However, to me it looks very much like it has been caused by the motor having run with a loose crank nut for a while (which is a fairly well documented XT660 problem). What’s likely to have happened is that the loose nut has caused a small amount of additional end-float in the crankshaft which has in turn put a lateral strain on the cage(s) and the outer one has given out and separated. The result of this has probably caused the balls in the race to make contact with each other, accelerate wear and led to the bearing failing.

Cage separation like yours is a very common problem on the main shaft bearing of KTM’s pre 2003 LC4 engines. Have a read of this and I think you’ll see the symptoms/results are pretty similar to yours.

crank nut was loose.
a week before it happen i did heard every now ant then some noise i did not heard b4 so i went to the shop and they listen but they say it a single and that the noise. i have a helmet camera and i record all my rides. i have listen to the video and there is no loud noise at all. not in the beginning 10 minuts.

What was the outcome did you repair it?