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Picked up an 06 yfz450 recently previous owner said it had a jet kit on it to support the bills balance exhaust it had, I put a stock exhaust on so im assuming I need to change the jets back too, what size jet kit should I get? Tomorrow I am going to take apart the carb and verify the current sizes and clip position ect and I will post it. Any info is helpful. Thanks! Also had no mods now besides a uni air filter.

Also my elevation is 700ft and currently its about 20-40 agrees here, im going to re-jet too so what are suggestions for best fuel mixture setting, clip position etc?
 

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Wow...is that rich for just a pipe.Find out what else what was done.If you have a stock motor now with airbox and lid I would start with a 42,162-165 main.mid clip on the needle if its adjustable
 
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