12th October 2020, 18:05
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#6
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This is my second home
R75 Saloon.
Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
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Could be the resonance frequency of a chain with a dead tensioner. Knocking against the housing it's running in.
Stops vibrating above or below this frequency.---
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