RIDE ON ADV is what I do !
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- Apr 4, 2011
With the knowledge that I have, I can't see anything in the picture that would be a result of "tight valves" (Picture is of the wrong side of the head)
The only thing that could possibly happen with tight-valves, is the valves would be held open longer or possibly never close completely. This would result in some burnt valves.(among other running issues)
I'm assuming the Camshaft journals are what the picture was trying to show (scoring).
This would be a result of low or no oiling, or possibly camshaft chain way too tight?
Without knowing any of the history of this bike, it's hard to say.
Possibly a manual cam-chain tensioner installed and adjusted way too tight? Or possibly stunting/wheelies ridden for distance at high rpms, causing oil to not be where it should be?
Hard to say?
Agree.............. the wheelie situation is a interesting thought. I don't have any other info, just probably one-in-a-million type thing, and found it interesting. Its probably not even an "yamaha type issue", it might be a customers 'fault' of some sort.....
who knows, just interesting ??