ADVICE:Baseline carb jetting/engine timing/spark plugs

RustyRatRod said
A 650 on all that motor? I think with nitrous it will run lean. Something you DON'T want. I could be wrong, but I think you have more motor than just a 650.

Please explain how you come to this conclusion? What does the size of the carb have to do with if it runs lean on nitrous?