HELP FCR3 41mm on WR400

i need help!!ive got the fcr3 41mm on my wr400..but mine boggs all through the mid and top end, and backfires like a machine gun.. ive already did send it to my mechanic but seems he is unable to fine tune the carb..wats the jetting and settings like? i have a FMF powerbomb header and whitebrothers e2 exhaust and the bike is on YZ timing..

any help appreciated please!!

:worthy: and yah, i noe fcr41 is meant for big bore bikes, but im stuck with this on my wr400..

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