Interestinggggg... I get pleaaure fixing this bike just a bit leaa than riding it.
I dont have a clear clutch cover but the check valve could be the issue because the noise goes away sometimes even at idle. I let it idle for 5 min with no noise what so ever but on my way back home in slow traffic it came back. So Im guessing this is an oil starvation cause by a sporadically functioning check value or something.
Im going to pull the oil filter today just to be sure and then take a look at the valve under the oil tank. Is there anything else I can check while in there?
Btw, unlike cjracer's case, the issue persists even with hot engine. I took that video after I rode home. I had to keep the rev above at least 2.5k to prevnt the oil light from flickering.
04 ADV 950