I have a 2005 DRZ125. How do I remove the white plastic retaining cap that is within the carburetor slide. I want to adjust the needle but I can't remove the cap to access the needle. It has a flathead slot on the top of it, but there doesn't appear to be any threads, so I'm not sure how to remove it. Also, does any one know the thread size specs for the fuel screw. I had trouble getting the stock one out because who ever removed the cap from the bottom of the carb messed up the inside quite a bit causing the fuel screw to come out very hard. I would like to pick up a tap to clean up the threads before trying to put a new screw in. Thanks for any help!!