Over on the ADVrider forum there is talk of new valve clearances that have been issued for the 650/800.
I inquired at my dealer and he sent me the new settings.
Intake - .23 to .33mm old settig was .18-.26
exhaust - .30-.41mm old settings was .27-.35
I'm not an expert, but I've always heard that if the valves were too tight it could lead to excessive wear on valve seats and valves. This raises the question of the long term impact on the older and/or higher mileage bikes that were run at the old settings.