Carburetor size

[m0c45]

im currently running a 46 piston with a stock crank, about 65cc on my scooter
also have a yasuni r exhaust
i have a 21 phbg and a 24 pwk but i dont know which one should i use
i was thinking about the 24 but insnt it too much?
is there any "rule" about carb sizes?

[Rune 75]

What is your top speed? What kind of cylinder, sport? What scooter?

In my experience sport cylinders don't gain much if anything by putting on a bigger carb than standard.

[m0c45]

94 kph
i have an airsal alu sport cylinder
thinking about porting it tho

[Rune 75]

Would try the 21. 24 is to big, will just be difficult to adjust.