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Jetting HELP !

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Hey Guys , new to this site and just looking for some jetting expertise.  I have a 1999 banshee stock air box with FMF Powercore II exhaust, K&N filter, no other real mods motor was a fresh rebuild last year.  Ive been messing around trying to get it bang on but haven't hit it yet. Its idling very low when warmed up and will die out if I let it sit, just changed to a 270 main, pilot is 25 ( I think too small ?)  air screws 2 out clip mid position.  it has a bog at low idle 0-1000 rpm ...pilot too small ?  any help appreciated, elevation roughly 1000

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Okay guys so changed the pilots to 27.5's and now as soon as I start it it revs through the moon ! Thoughts ?  Cant find any air leaks , could a slide be in wrong ? float stuck ? the checked the top of the caps too...cables are not stuck , slides are all the way down..   spent two hours trying to figure it out.  Any ideas greatly appreciated

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