jettin my new carb

[drews250r]

Hey guys help me out i have just got a new 38mm keihen carb with the boysen super bowl. What jet size should i start out with. I have boysen carbon fiber reeds an esr trx5 pipe and had it port and polished fo mx. The motor is bored to 67.5 mm. do you guys know what jet size i should start with.

[86 Quad R]

what was the previous carb ya had on it?

[drews250r]

i had the stock size carb on it. i think they r 34mm.