got a deal on a 96 rsstd w/only 9k miles this summer! been a blast to ride! previous owner installed a dyna 3000, and a barrons big air kit, and aftermarket slip ons. my only issues have been exhaust popping, mainly during warm up, but also during ride when downshifting. and poor fuel economy. about 95miles and i am switching to reserve. ignition is set at 6500 rev limit and curve 4. plugs look good and she idles smooth. any input would be appreciated. thanks.