Installed a PC pipe and have some severe bog between 1/4 to 3/4 throttle. I'm trying to do some carb re-jetting. I wanted to look at the needle jet and clip setting but the two tiny screws in the carb slide which I believe need to be unscrewed to access the needle are stripped. Can't seem to reach the screws with anything but a screw driver. I can't get one unscrewed. Any thoughts? thanks in advance for any help?