Evo noise (clutch)

[HOOKYH]

Hi, have quite a loud whining noise that comes and goes with clutch engagement. When its disengaged there's no noise at all.

Had the clutch apart and all seems fine, did wonder if it was the basket bearing but there's no play. Haven't changed oil type (nano trans) but has fresh oil. Any suggestions welcomed.

While im here does anybody have any tips for putting the clutch cover o ring in place? Has literally just taken me longer to put the cover back on than take the clutch to bits, inspect it, clean it and reassemble it!

Edit: 2012 250 2t

Edited Monday at 02:08 PM by HOOKYH
Forgot to say what bike

[Tr1AL]

On 10/13/2025 at 3:07 PM, HOOKYH said:

Hi, have quite a loud whining noise that comes and goes with clutch engagement. When its disengaged there's no noise at all.

Had the clutch apart and all seems fine, did wonder if it was the basket bearing but there's no play. Haven't changed oil type (nano trans) but has fresh oil. Any suggestions welcomed.

While im here does anybody have any tips for putting the clutch cover o ring in place? Has literally just taken me longer to put the cover back on than take the clutch to bits, inspect it, clean it and reassemble it!

Edit: 2012 250 2t

Use silicone grease on O rings to make them stick in the grooves of casings during assembly. whining noise may be the primary gear with the clutch meshing , Check the nut that holds the clutch  basket/bell on is tight.