Carb size

[BlasterRacer69]

so I have a fully built KOR built blaster fully drag ported, shaved head, 240 Vito's big bore bored to 73.00mm, +3 Vito's stoker crank, v-force 4 reeds, lightened fly wheel, advanced timing by 4, RDZ big bore drag pipe. I'm having a issue getting it tuned thinking i need a bigger carb I have a 34mm mikuni flat slide running with a 320 just needle all the way down running a little rich but when I go to a 310 jet needle all the way up its leaning out please help thanks

 

[Jimmer]

To me, that carb is pretty small. I run a 217cc ported motor,VForce4 reeds,big K&N filter(no airbox) with a pipe. My carb is a 36 TM and here is my jetting:389 Q-6 needle jet,6FJ40-3(needle in middle),40 pilot summer,45 pilot winter,4.0 slide and of course 3.3 needle and seat, main jet 310 up to 350. Make sure you have 3.3 needle/seat and if your needle jet(big brass) is too lean it won't flow enough for big main jets.

 

[Jimmer]

Why did you go from full rich to full lean on the needle? That is too drastic. One step at a time.

 

[Awk08]

I run a 34 keihin on my KOR trail port
I'd say a 38/39mm for your setup, you'll find much more info for keihins than you will mikuni's

 

[BlasterRacer69]

Why did you go from full rich to full lean on the needle? That is too drastic. One step at a time.

With full lean and the jet it's still rich if we drop to a 310 with needle all the way up its to lean