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Hey Steve, that picture shows what a recessed valve looks like. I'm pretty sure that your exhaust valve there is sunk way down into the seat. It's a good thing you took that cylinder apart when you did.DANGIT...
Pulled the heads to do a complete top end seal since I lost the head gasket on the left a week or so ago. Found a bit of an issue as I noticed a sign of major heat scarring on the intake rocker and the bottom nut was loose. A little sink in my mood of just replacing the gasket.
I had checked torque when I was going thru the bike when we first got it and recalled that same head bolt was the one not near torque value.Yet it tightened back to spec. I was closing in on another oil change and valve check. The bike has been running well and no signs of a leak or popping until it let go.
I had found most of the service history and never saw a head re-torque in it's 20K previous life. Maybe it was just waiting on me.
The threads are shot on that stud and must have been working itself loose again. End result is a damaged head. Good news was the valves and piston dome are clean from any carbon build up and I think the gasket mating surface on the left cylinder isn't damaged. Now have two 750's on the lifts waiting on parts and patience.