A few weeks ago I had a stator mount scew come loose. It ground half the head of the screw off and left a groove on the outside edge of the rotor:
I installed a new screw, buttoned everything up, and changed the oil as a precaution. However this rubbing/whirring/whining sound is still there.
It was kinda hard to identify the location of the sound when the screw came loose, but noticed a slight vibration from the stator cover when it happened. The sound now also is hard to track down...I've listened with an automotive stethescope but can't narrow it down.
Things I've checked...
Starter clutch gear only free spins clockwise and doesnt have really any play and will lock if turned opposite way so I'me assuming its good. Nothing else (bolts, rotor, stator, stator wire guides) on the left side were loose. Starter gear was correct with washer/gear/washer orientation.
Pulled the clutch cover, clutch hub/basket, and oil pump. Everything looks good with no abnormal movement wear.
Pulled the valve cover thinking tight valves, or cam wear (everything looked ok 200 miles ago). Nothing looked out of place/worn. Cam caps were torqued and tight, cam lobes looked good, rocker pads looked clean, valve lash was spec, and everything was coated with oil. Ape manual tensioner was still holding chain correctly with just a bit of slack and not too tight.
Plugs look good, with no fine bits of metal that indicate wear in teh cylinders.
I've never had it low on oil, and it's never overheated...and with about 2k on the clock since the rebuild, and 22k total on the bike, I wouldn't think I'd be having a problem in the bottom end.
Here is a small clip with the noise:
Nic
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