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Jetting or Oxygenated Fuel - High Altitude


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I'm going to be going to Kennedy Meadows in a few weeks and was planning on having to re-jet my 2008 CRF450R (stock jetting) due to the altitude being 7,500 - 10,000 feet there.

I mentioned this to a friend of mine and he says I should just run oxygenated fuel to compensate for the thin air and not bother with the jetting.

Does this make sense? Anyone tried it?

Thanks.

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never heard anything about that, but changing your needle clip position and swapping a pilot and main jet are really easy. i'd just rejet it.

rdalley just gave you some really good starting points. i just got back from riding 8000-11000 feet. ran 40 pilot/2nd needle slot/170 main and it ran perfect.

took less than 30 minutes to rejet.

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I went to Colorado with my 450 and chose to use some VP U4 instead of rejetting. The bike kept more of it's sea-level power and ran great up there. Nice and frisky, and faster than the guys that didn't do it.

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I went to Colorado with my 450 and chose to use some VP U4 instead of rejetting. The bike kept more of it's sea-level power and ran great up there. Nice and frisky, and faster than the guys that didn't do it.

And it was jetted for sea-level, I assume? What elevation did you get up to?

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