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2001 315R jetting for 8,000 feet

bikepilot
in Montesa

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Hi all, I've moved back to Colorado and brought my 315R with me.  It is jetted for sea level and ran great there.  Not surprisingly it is super rich at my house now (I generally ride from 7500-9k').  I have lots of jetting practice and brass from my MX and enduro bikes, but have never opened up the carb on this bike.  If anyone has recommendations on jet size to get in the ballpark that would be super helpful.  Also what is a good source for jets for this bike?  I have lots of brass for my enduro bikes but they are all Mikunis and probably much larger jets. 

Thanks! 

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