Had a problem trying to adjust my carburetor, Heres the deal, If you are having issues with a good idle. You just might want to take a look and see if your getting gas in your vacume line to your intake. My idle was up and down and sometimes it even quit. I found out later the vacume line was getting gas in it from my petcock. My buggy had a vacume pecock gas valve and the diaphram had failed in my petcock letting fuel run right to the intake vacume access. Not only did this cause a unreliable idle but gas went into the head and down into the crank case..NOT GOOD!. So after a new petcock and clean oil restored back to my buggy, i got a good idle once again...hope this helps someone.