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Just got a new '06 Foreman 500 ES. Live in the Dallas area with an average altitude of about 600ft above sea level. I frequently go to Red River, NM and want to take the bike up there. The altitude ranges from 8,500 to about 12,000ft above sea level. My question is this. What is the stock jet and what do you recommend to change it to for about 10,000 ft elevation? Also, any particular brand better than OEM?
 

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i have encountered the same problem. i live in sacramento, cal at about 52 ft. but do all my riding in the sierras. i found that i was always running too rich at altitude. this was compounded by my plans to ride paiute trail with elev. going about 12000 ft. first, i purchased the dyno jet kit. there have been complaints but i followed the exact directions for rejetting to 3000 ft. and the foreman went to 11500 ft. in utah. since then i installed the hmf pipe which leaned it out a little more. the dyno jet kit has multiple jets and redesigned needle that also is adjustable unlike the stock one.
 
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