during my dyl upgrade project i noticed a couple of things regarding carburetoras,
if u r going with a carburetor with small venturi then u will get an excellant bottom end,, means pick bahot achi ho jaya gi,but the top speed will be less but will have a lot of power,, laikin fuel avg achi hogi and fuel burn acha hoga,,because air.fuel mixture wil enter the cylinder with greater velocity and make excellent turbulance which ill result in good fuel burn,
but with biger venturi carb it is opposite,,
bottom end pa pick kam ho jaya gi,, bike speed aram aram sa pakra gi laikin full throttle pa top speed bahoth hogi,,
and obviously if it is jetted correctly,,
i tried with default carb of dhoom bike top speed was 80 km/hr and pick was awesome,,
with qingqi carb of big venturi top speed is 100 so far and pick is a bit low,,
same was the issue with cd 100 and cg 125 carbs which happens to have slightly bigger venturi ,,