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Riding at altitude

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Taking my 04 250R on a trip this summer that will have us in the 6,000-8,000ft altitude range.  Went to the same place last year and it bogged/sputtered in the low end but it was due for valves, etc so not sure if that had something to do with it.  Any input on how sensitive these bikes are to altitude?  And what jetting would you suggest if so?  Thanks!! 

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You will definitely have to re-jet for that altitude. There is a chart in the service manual that gives guidelines for jetting at different altitudes. If you don't have the service manual it is available in PDF form on the net, just google it there are several sources.

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