Need some help from the consortium after pulling my hair (all 3 that are left) out for a bit on this issue. Bike background: Bought the bike earlier this year with ~14k miles on it for $400 to fix up for a 'cheap bike challenge' some friends and I were running (put together a bike for <$1k to ride down 300 miles, spend 3 days riding off road, and ride back). Bike didn't run when I got it...had a temp tag from '08, with tires from '98, so realistically it ran last about 20 years ago. Rebuilt the bike, fired up and ran just fine, but had a ticking noise present from that first startup. Checked valves, and found a few out of spec on the high side, but did not seem to cure the issue. Went on the trip, bike did fine, noise is still present, hasn't gotten any better or worse. Bike starts, revs, rides fine, just has the nasty tick. Reviewing the valve lash procedure, I realized that these are quite a bit finickier than most engines, and realized I didn't have the cams pulled up into the upper half of the journals while setting them. So I opened it up last night, and reset lash to 0.005in / 0.12mm per the factory manual. No change in the noise. Shot this video quick last night to try and capture it. Frequency of the noise is 1/2 crank speed which really would scream overhead still to me. There's no bearing material in the oil, cam lobes and journals all look good with no pitting or galling. Stethoscope says it's coming from the back right cylinder, but can't really narrow it down to overhead or base engine. No difference in whether or not I squeeze the clutch in or not. Is there anything that anyone could think of that I should check? It's bad enough I'm half spooked to ride the damn thing, but can't figure it out! Had an earlier '83 750 when I was younger, and it was silky smooth in comparison to this knock.