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how should i jet my yz250 at 4,500 ft plus

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Depends on how cold it is, whether you are riding higher trails or staying at that elevation on a MX track, and the year of the bike.

 

Assuming 1999+ Keihin, trail riding, 4500 ft and higher, temps around 50F, something like this:

170-172 main
42-45 pilot
N3EK needle #2

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