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proper jetting

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I have an 84 XR500. When I get to about 5000 feet, which is a regular thing, it seems to be down on power and does not really want to run. Normally the plug looks like it is running a little rich.The plug is dark. What would be the proper jetting. I have never changed jets on this bike and do not know what I am getting myself involved in. Do the carbs have to come off? Can I change the jets on the bike.

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