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Moving to higher elevation...... What do I need to do

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I am living in Raleigh NC right now and have a 2012 Yamaha YZ250f, I am moving to Reno, NV in a couple weeks.  Most of the riding I will be doing out there will be between 4,000ft -6,000ft.  What do I need to do and more specifically if it is a re jetting that I need can you help me with specifics.  I am new to this only started riding this past November but I want to learn.  I rode a 250 and 450 while I was out there visiting a few weeks ago and though they had good power they could hardly idle.  One of the guys I was riding with said this was due to re jetting the bikes incorrectly.  Thanks for any help.

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We went from the gulf coast to Colorado several years back for a week of riding. I took several different main jet sizes, all smaller, and played with the jetting the first day that we got there. Once I found the correct size it was done. I also called ahead to a KTM dealer up there for a little help on the range of jet sizes to take. Your existing pilot should be ok.

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