help tuning 2000 banshee

[ranger505]

im asking for help im not good at tunning my carbs today i put my motor back together i put a new crank new top end and i had the cylinders bored out to 66.00mm and i put a pro design cool head with size 21 domes the cylinders are ported i have 290 jets in the carbs but it still sputters i pulled a plug and it was real dry and black i live in albuquerque new mexico please any inofo would help thanks..

[hondamancbr03]

Elevation?
Pilot jets size?
Needle location?
Stock needles?
Sputters at what point in the throttle? Low/Mid/Top?
Air box or not?
Are the carbs sync?

[lukey]

ditch the stock needles for some toomys needles then adjust the timing a little at a time.