High idle with various causes, what else do I check?

[hannibal]

I guess I never thought too much about it. I was thinking the clearances got larger due to wear at the cam lobes. Where is the shrinking coming from?

I had the same idea when I joined the forum. The guys here straightened me out. As you already found, the wear occurs on the valve seat, making the valve rise closer to the cam lobe.

[ddlaz]

Well, not sure what the actual problem was but I put the new viton orings in the old boots and nothing changed. I then got new intake boots on with the new orings. One oring fell off during assembly(didn't know it at the time) but the idle was still high. Took airbox off altogether and ran it with decent, low idle. I thought it was fixed. While putting airbox on, noticed the oring under the carbs. Took all carbs off, rings in place, no airbox - high idle again!
Cleaned carbs again, checked diaphragms, reinstalled carbs and airbox. Runs great now.

All sorts of weird scenarios. I guess my problem was a bit of everything.

[60ratrod]

Make sure you vacuum sync those carbs. It will cause lots of other problems, as i found out the hard way

[ddlaz]

Will be tearing down the bike again this winter for new exhaust, cleaning and painting the engine and frame. I'll sync after that.