rondob4 Posted October 20, 2007 Share Posted October 20, 2007 My 99 RT was running rougher after the 12K service than before, particularly on the bottom end and at idle. I took it back to the shop and they spent a couple of hours on it, with the fix being to raise the idle a bit. A few days later I replaced the Bosch plugs with Autolites and the problem was largely cured. About a month later it started idling roughly again, and it was suggested on this forum that I try carb cleaner sprayed in through the Big Brass Screw (BBS) port while running. I carefully marked the position of each screw in turns from lightly seated, then extracted each, one at at time, spraying the cleaner into the port while running at raised idle. Each BBS was covered in soot-like material and I cleaned them before returning them to their original positions. Bike ran pretty well. I then decided to check the carb synch with my brand new TwinMax. I carefully followed the calibration directions included with the TM, then attached the hoses to the ports on the bottoms of each throttle body. The TM was balanced at idle and minimum sensitivity. As the sensitivity was raised to the 2 o'clock position, the needles shifted to the right to the 2 declination. Turning the sensitivity higher (to the 5 o'clock position) did not move it further. Running the RPMs to 4K and repeating the process also produced no changes in the needle positoin. I followed the directions to gently turn and check the BBS on that side (the right side) and nothing happened. I turned the BBS the other direction with no change. I turned the BBS all the way in, no change (needle still at 2). I turned the screw back to the original position, no change. Again, at 4K RPM nada. I rode the bike and it feels fine, no noticeable vibration or strange feelings. So what have I done wrong? The TM hoses slip rather casually onto the nipples; maybe they're not tight enough? Any suggestions out there as to why moving the BBS didn't change the TM readings? Link to comment
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