Valve prob? My RC feels down on power listening to the engine rev seems to no really hum till over 4.5 to 5..5 rpms, also noticed that one exhaust is much hotter than the other! Even if I only have it running for a minute or so. the left muffler is cool, and warm inside, but the right muffler is already really hot! I have a PCIII with a map that I believe to be good enough, akra slip-ons, pair removed K&N filters and bike has 18,000 miles on it. Got the bike with 15,000. Any ideas?