I'm doing the 3x3 mod to my SM and I just ordered the JD jet kit a few days ago. Now after reading some more posts I'm thinking I should have ordered the fuel screw too. (The bikes I've had before never needed an aftermarket part to adjust the carb.) Anyway, is the fuel screw really necessary to adjust the fuel-air mix? Should I order one before I take it apart? I've done searches on the subject and haven't found any solid answers.