Hi this is my first time posing a question on this site. First of all I am really glad we have this site for gixxer lovers. Anyway, my question is I have a K6 GSXR 600 that the previous owner changed the front sprocket (down 1 teeth) and he had a PCIII installled as well. Could someone please tell me what exactly PCIII suppose to do. The second part question is how can I get a more precise reading on my MPH speed. Thank you for taking your time to read this and answer my question.