Hi, The good news is that they are the needle adjustment screws, the bad news is that you have to work to get at them. After spending quite a bit of time on the phone with a great guy at the Walbro distributor in Ohio, I found out that this is a new design mandated by environmental concerns. The guy I spoke with also found out that there is an adjustment tool, however it will not be available for anywhere from two weeks to two months. I then took my dremel with a cutoff wheel and cut back the casting around the needle screws and then cut slots in the top of the screws. It works just fine and I don't have to worry about any special tool, any slot head screwdriver will do. I hope this helps anyone else that runs into this problem