Ok, I've had a look at the head, the inlet valves have shiny stems now but the guides seem good, the exhaust valves still have the coating on the stems but the guides are worn a lot. I would have expected the opposite myself. Seats and seals all look good. I'm thinking now that maybe the machine shop did a flunky job of the valve to guide clearances, at the time I put the valves in my mind was elsewhere and I didn't even give the valves a wiggle, shaking head now. I'm just too damn trusting
So not the disaster I was anticipating but still need new exhaust guides and I have a full set of Yamiya valves.
On a side note, it appears cylinder 4 was running hot, air leak at rubber intake?
After 2500Ks the hone marks are still visible. Next time I'm gonna do the flog it run in instead of babying it. Oh and just a note on the head gasket, geez I couldn't believe the lack of torque on the head nuts. The 4 x 6mm bolts under the pucks were doing nothing. The two 6mm bolts either side in the middle of the head outside of the cover weren't much better and the 8mm nuts wouldn't have had 5lb on em. I had no leaks at 2500Ks but this time when I get the bike running ( I have Frank's frame kit) I'll be pulling the cam and cam blocks out and pulling up the pucks and re torquing the whole damn thing and hope it stays torqued some time before 500Ks I reckon.
I have Ape HD studs but they look to be longer than the stock ones, I think I'll just go with the stock ones, I reckon 18ft lbs should be plenty now that I've seen this thing with all the head nuts n bolts pritt near bloody loose.
In the end, what's the verdict on the superflow valves? Dunno!