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08 yz 450f jetting help

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anyone, I could use help on jetting my new 08 yz 450f.

Elevation 650'

exhaust -two brothers m7

zip-ty carb mod completed

right now jetting is stock-fuel screw 2 3\8

Kind of hard to start and shooting flames out exhaust and some popping

any help would be greatly appreciated

thanks in advance

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48 PILOT AND 168 MAIN IS perfect!! We have 4 08's one of them has a 50 and 170 but the others are the same..:confused: No more popping and they start first kick anytime day or night.. go 1 or 2 turns out on the fuel screw!!!

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