i have a 93 dr 650 suzuki that i have installed a 41 mm mikuni tm carb on. the carb came with the following parts 17.5 pilot 6fj40 needle 389 q 2 needle jet 1.5 air jet 250 main jet # 4 SLIDE WITH THIS CARB AS IT RUNS GOOD ON THE MAIN BUT RUN RICH IN THE MIDDLE AND LOADS UP AND STOPS RUNNING ON THE PILOT . SINCE THIS TIME I HAVE INSTALLED THE FOLLOWING PARTS #10 PILOT #12.5 PILOT 6FM46 NEEDLE and it is still running rich with black smoke on the idle then stalls would changing the needle jet help me or any information i can get would really help