I recently removed the head to do piston and rings on the bike and noticed a fair amount of carbon build up on valves and exhaust ports and also noticed that the ports have pretty rough castings. So I am considering getting the ports cleaned up etc. Was wondering if anybody has done theirs and ran into any problems. I don't expect any performance increase but thought I may as well get it done while I have the head off. Am I waisting my money getting it done? Should I rather just clean the carbon build up myself and get it back together? I still have stock ECU and from what I understand it does not compensate for better flow. Just interested in any feedback from people that have maybe had theirs done.