Mikuni VM26-671 carburetor from Kitaco comes with 150 main jet, 15 pilot jet, 4J13-2 needle, and Q0 needle jet. If using on CRF50 124cc builds, you'll likely want to add in around a 190 main, 22.5 pilot. CRF100 125-145cc builds will be closer to 200-210 main, 25 pilot. (jetting is very specific to your build and location so consider adding in a range of mains and pilots)