I just bought my first street bike recently and don't really know a lot about bikes in general but here is my question. Just recently it started having a problen while it was in first gear. The bike will rev up in neatural but when you are in first gear and trying to accelerate it wont rev up very quickly and then it will finally after like 5 sec take off, well today it wont rev up at all when in firtst gear and it will just sputter and feel like it about to die. The original owner said the carb had been jetted will that affect anything. I took the #1 and #4 plug out and they were super black, am I buring too rich. Any tips on tuning this thing, the plugs were NGK R's, what should the gap be. I think I found the fuel air mixture screws, should I mess with those. How do you get to #2 and #3 though, could that be one of the problems, the fuel air is off. Anything else that I could do or anything else that some one can think of that may be causing the problem. Thanks for any help.