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Jet settings

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Hey all,

 

I have an 05 yz450f that I have put a complete exhaust on (powerbomb-powercore 4). I'm about 1500' above sea lever with a huge weather change pattern here in N GA. I've never re jetted this bike and am wondering yalls opinion on what direction to go. Any ideas of jet size? Is there a chart or info somewhere that I can locate for what jets to put in? I've looked and haven't found anything yet. Thanks.

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I have an 05, and am roughly the same sea level. My jetting is pretty spot on using a 45 pilot with a 170 main and clip in 4th position. Also using a boyesen quickshot and factory FX fuel screw at 1 1/2 out.

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Reading plugs with unleaded gas is next to impossible, and very often very misleading.
Start by reading: https://www.thumpertalk.com/topic/272073-burner-how-do-you-confirm-the-mainneedleneedle-clip-for-a-fcr-carb/#entry2289879
...Then: https://www.thumpertalk.com/forum/showthread.php?t=694916
 

I hear ya...it has yet to steer me wrong.
I can "hear" it, but I can "see" it, with a brand new plug.
Lean is pretty obvious.
Rich is pretty obvious.
The correct A/F ratio, is just pretty

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