Too tightly adjusted valves will definitely affect the idle. the warmer it gets, the worse the idle will be, it won't idle at all when it gets hot. If it runs too long this way you can damage the valves. Next time you have the valve cover off take a good look at the exhaust valves and see if they've changed color, they can actually turn blue, as well as the rocker arms. Then you want to check compression to see if a valve\seat damage has occurred.
Found this all out on a, errr, ummmm.........friends R65ls
'06 R12GS, '13 s1000RR
Originally Posted by Big Steve
I've yet to see a poor person driving a real gas hog......
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