Where are you? Do you have a shop manual? If you are anywhere near LA Paz, the Honda dealer there will do a fantastic tune up.
The pilot screw is inside the carburettor, and would need to be turned inwards to make the the fuel run leaner.
A better alternative is to put smaller jets in the carburettors. KLR shop manual has this info.
I put smaller jets in my bike and the difference on the altiplano was remarkable.
When you go back down to sea level, you have to take it really easy, though, until you change back to the stock settings. Bad things can happen.
This from the KLR faq:
http://www.bigcee.com/klr650faq.html#intake
This from google - probably far too much info
http://www.racermec.org/EnduroAnswerMan1/Responses.htm
BTW, I am far from being a mechanic. Check out this list for all the help you could ever need:
DSN_klr650@yahoogroups.com
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