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Old 24-03-2024, 10:02 AM   #5
Dukedesmo
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Join Date: Sep 2010
Location: Leics
Bike: M900
Posts: 2,894
Strange indeed, never seen such a failure before but the good news is that the seal looks fine and a new spring fitted though I doubt it would actually make much difference without a spring? other than maybe on the front cylinder exhaust where the oil pools around the valve.

The (complete) spring is a circle with OD of 12mm, ID 10mm, 1mm thick so call that 11mm overall length, in which case the circumference (C=2pi r) should be 34.56mm and I have 34mm so I'm saying it's all there or at least any remaining fragments are so small that they should get caught in the filter so I can't see it being a problem.
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Last edited by Dukedesmo; 24-03-2024 at 03:36 PM..
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