Alrighty all you motor heads. Need some help. I ride (albeit slowly) a 05 RMZ250. Looking to put a ajustable fuel screw in. So, I thought all I needed to do was unscrew the factory one and it would fall out and install the new and improved one. This is not happening. The factory one is not falling out. Please tell me I don't have to take the carb apart. Am I missing something very easy here.