We are running a.038 in my sons 212 . His friend has the exact same setup as his, and his ran like crap with the .038. We ended up leaving a .041 in his and it runs nice. They are cheap enough to buy, so get a few different sizes and see which one works best for you. We bought .036-.042.
I know "gopowersports" is a naughty word around here, but their filter/header kit comes with a .038 jet, just like idle mentioned. I ran this same setup before I built the engine and it ran great.
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