Yamaha Discussions about Yamaha ATVs.

jetting and altitude?

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Old Oct 4, 2001 | 04:43 PM
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Batoutahell's Avatar
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Do you guys rejet when you go to different altitudes. I am jetting my raptor tonight and have read the dynojet instructions and they give you a list with what jets to use for certain altitudes, but do you rejet when you say go below certain altitudes.

I live and ride mostly at around 6000 ft and then I travel sometimes to places that are in the 3000-4000 ft range. I plan to jet for the 3000-6000 ft range that dynojet gives you. But if I go above or below that range would I need to rejet.

I know that last time I was down around 3500 ft the bike ran much better than it does at my home around 6000ft. I don't think it is jetted right for this altitude.

What do you guys do?

Thanks
Paul
 
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Old Oct 4, 2001 | 05:38 PM
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Dynojets written instructions assume certain mods that you may or may not precisely have.

I was suprised when I called dynojet and was told to ignore the written instructions, since my mods varied slightly from their typical mods. They then told me which jets/settings to use for my particular setup and altitude, and they were right on.

Find their ph# at dynojet.com.
 
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Old Oct 4, 2001 | 11:54 PM
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I took my Raptor to Colorado this summer and ran it up to altitudes of 10,500' running a FMF pipe and 140/145 jets and was very happy with the way it ran. I was expecting the worse but didn't feel I needed to back off on the jets at all because it was doing all I asked of it.
 
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