Originally Posted by LandsVW
I took out my left main jet and my idle jet. I have a 125 and a 45 in that carburetor. So the 45 matches up with the year but the main doesn't. Wonder why previous owner has gone leaner? I guess I should pull the right carb jet too and see what I have. I cleaned the idle jet and got it to fire on every kick, but even with the choke on it doesn't want to stay running although if I kick it enough, once it gets a little warmer it keeps on running. I also cleaned, but haven't installed, the air filter so once that is on it may richen it up enough to compensate. It was pretty dirty and I should probably throw a Unifilter on there...
Is your idle maybe low? Or is your pilot jet lean? Also make sure you don't have any air leaks between the carbs and cylinder head.