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Thank you, I will try the roll test.

I did change the output shaft oil seal. But like you I don't see how an internal bearing would behave in that manner. I will check the condition of the gearbox oil. If the shaft was walking as you say, then there might be powdered alloy in the oil. It still seems to me as an external noise. Thanks K...

Thanks Kurt, if all else fails I will check that out. Cheers

A bit of additional information: My R100 has a sidecar and has Unit Leading Link forks, and the Brembo brake calipers are underslung on the active arm of the forks. Hi This one has me baffled. I am getting a noise that sounds like a bearing whining very loudly, that stopped when I applied the front ...