I have a vance & hines 2 into 1 pro pipe on my bike. I took the baffle out yesterday and ran it to find out that it was running too lean. I called Dyno-Jet to see how to re-jet my carb, and they said to go up one size on the main jet. The stock size for the carb is a 190, and for some reason the guy I bought the bike from had a 180 in it. He said that he had it re-jetted after he put the baffle back in for a state inspection. I went down to Harley and got a 195 main jet. To my luck when I pulled out the old jet I noticed that it had a different thread pattern and was smaller in diameter. As far as I know I have a stock carb. (harley logo on the left side). What could be my problem here? After market jet kit? Or... Does harley make two different main jets? I just need to find out what kind so I can find one to fit. Any input is greatly appreciated.