08 yz 450f jetting help

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

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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