300/440/550 which size mikuni?

Location
CA
I want to stick with a single. Kiss Theory. From what i read i think i would go for a 48. I have a 650 X-2, Bored out 1.5, Rad Billet Crank, MSD total loss, Girdle head, and so on and so on. I have the MRD injection on it now. What do you guys think, recommend? I would really love to put a stock 750 in it.
 
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