I have a cbr600f4 and it seems as tho my rev limiter is not functioning correctly. The tach does not stop at 13500 rpm. But Continues past 14000 rpm. I have not tested to see how far it will go . The bike runs great as far as i know and has lots of power. I changed the sprocket and exhaust, could this change effect the rev limiter? what might be causing this problem?