421 on mikuni yz125 38mm carbs I think

[midospike]

I have a 421 cub with small cpi inframes, v3 reeds, No port work. I am looking for help for jets. pilot and main. any help would be great. For mains i have 440 420 445. pilot not sure what it is. it has no markings. In chicago so sea level is 500 above. I also ride in mich at the dunes.

[armyvet]

start with the 420s...