300/440/550 550 wpn't rev up 550 guru's

[x2ryder]

I just put a sbn 44 on my stock 87 550. The carb has a primer 2.5 needle and seat, 120 pilot, 140 main, 80 gram spring. One turn out on the fuel screws. It does not want to rev very well. Seems pig rich. I also have a 125 main in the return line. Any help would be greatly appreciated. Thanks

 

[x2ryder]

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I turned the low speed screw in 1/2 turn. Seem to rev up alot better.