Best carb size ?

[Redsea67]

Hello
I have Yamaha slider and att THE moment i have
Stage6 6 MK 2 70 cc sport pro with 21 mm stage6 RT carb pwk.
STAGE6 RACING CLUTCH
STAGE6 R/T OVERSIZE CVT KIT MK II D=107MM.
STAGE6 R/T CLUTCH BELL 433G.
STAGE6 PRIMARY TRANSMISSION
STAGE6 INTAKE KIT MK2 OVERSIZE with STAGE6 V-FORCE 3 REED Valve
Yasuni c 16 carbon exhaust.
Ported engine block mm
MVT INTERNAL ROTOR IGNITION PREMIUM WITH LIGHTING.
And hpc crank with c4 bearing SKF with polini viton sealings.

I have bought THE MXS RACING CYLINDER KIT 70 CC
AND WONDER WHAT IS THE BEST CARB SIZE FOR THIS ?

ANY THOUGHT ? OR RECOMENDATIONS?

BEST REGARDS STEVEN

[speedpro]

The 21mm carb is probably just fine. You could probably stretch to a 24mm carb but I think 28mm would definitely be on the too big side. You have to be able to tune it and ride it. you might get more power with a bigger carb but you can run into difficulties.

[F5 Dave]

I've been holding off , but here we go. 100% 39mm PWK.
Then just graft on a KTM300 barrel to match. Made for each other.