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what i have is a 5mil stroker motor with ported 61x cylinders, 61x cases, coffmans exhaust and dual 44mm blackjack carbs. my problem is that this motor is weak on bottom end but rips from mid to top rpm i am more interested in riding freestyle so i need some low end power. My question would be...

i am running a 61x motor with a 5 mil stroker ported cylinders and coffman pipe, i have a pair of 44 mm black jack carbs but no internals i was just wandering what size needle and seat to go with as well as base jetting, pop off pressure and spring rate