I got this problem too!
Black power and quite a bitt actually...
Also the idler gear is worn at the top of the teeth.
I also notice that there are some chips of it,
some little dark spots like the top metal layer is removed.. (just some small spots) maybe this causes the idler to wear quicker.
Also the bigger gear seems to be worn a bit I now have my B4.1 for 1,5year I guess maybe it's time to replace the gear?
I just wanted to start a thread actually because I'm looking to but a X factory Top shaft, I'l heard somewhere that it quality is much better.
So my question is does it fit the B4.1?
I run the silicone grease, also I'v heard that some people run silicon oil in there diff. I think around 50wt and just a few drops.. Could this help?
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