this was a regular discussion around 2010/11
No definite fix some successes were to use different oil (belray gear saver was a huge improvement for me), others drilled holes and what appeared to be the most effective was removing all the unnecessary friction material on the friction disks (ie so you are left with tabs of friction material and then bare metal inbetween. I tried to do this and after sorting out ONE tab i decided i could live with the squeal!!)
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2003 txt250 Pro
2013 Ossa 280i
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