First of all, the bike is a 2004 CBR600RR with 5500 miles. Bought used recently. Only been down once, me at a stop light. 0 mph and a scrap on the clutch cover. Having an issue and looking to see if anyone has had this problem before. If I am out riding for 30 minutes or longer and the bike is warm (over 200 degrees) I get some hesitation or surging when I whack the throttle all the way open. It doesn't happen at 80% throttle, only wide open. On Friday I rode from downtown Columbus, OH up riverside (stop and go) for 30 minutes and ate lunch. On the way up I was running my high beams and the last couple of miles of the trip it would fall on its face at full throttle, then surge forward, then fall on its face again. On the way back to work, using the same route with my highbeam off it didn't do it at all. It has done this with a nearly empty tank and a full tank. There appears to be some scaling in the tank, but this only occurs when the bike is hot and I get no warning lights (FI etc) when it happens. I checked the battery at autozone and it registered 12.5V under load and it registered the CCA as 1800. That indicated to me that perhaps there was a problem with a cell. I replaced the original battery this weekend with a new Yuasa and it still happened. This time is was at less than full throttle and once I pulled off to check it the idle was swinging between 1000 and 2000. I shut it off for less than 10 minutes and it didn't happen again during the next hour of riding. I put Techron in the tank and ran the crap out of it as I have been commuting with the bike. It as never exceeded 228 degrees while riding and this only happens when it is over 200 degrees. In cooler weather or at night this never happens. The intermittent nature of this seems to indicate to me that some sensor is having an issue. I hope its not TPS. Could it be the MAP sensor? Sorry for the long post. Any ideas?