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Is there no way to get the jetting spot on with the stock needle? I 09 450xc changed the pilot to a 45 and moved the clip down 2 positions. This is pretty good, but still a little lean.
 

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Lean? what mods? what main jet? if the bike is stock you should be somewhere around a 160MJ, 3rd clip on the stock needle, I was at 180MJ, 3rd on the stock needle, 45 pilot, with full HMF and 41.5mm carb, bone stock I was at 160MJ, 45 pilot, 3rd clip on needle, (525 XC) Honda HRC needle works better, and smooths out the AFR
 
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