I just upgraded from an 05 to 07 cbr 600rr. It has 6300 miles. My mods are 2 brothers slip on exhaust, flush mount signals, and fender elim. The bike sputters at high rpms, about 13000. The bike had WAY too much oil when I got it. First thing I did was put 10 w 40 royal purple oil since I wasn't sure when the last guy changed it. The f1 light was on when I got it. With the right amount of oil it helped with the sputtering. Next I thought dirty injectors, added a half gallon of race fuel to a full tank of gas. Didn't help. My f1 light gives 2 SHORT blinks. I THINK that code is map sensor error. Tomorrow I'm taking the tank off to check the hoses. My buddy thinks the guy I got it from may have had a power commander on it and took it off before selling and didn't reconnect something right. Does anyone have any ideas on wat could be going with the sputtering and f1 light?