I have an 04 600RR with 38k miles. It's been running extremely hot. It will climb to 200F on the freeway while cruising at 70-75mph. The outside temp is COLD, like 55F. I've flushed the system and checked the thermostat by placing my thermostat in 180F water. It opens up with no problem and is wide open at 190F. My bike gets so hot in traffic that my fan is always on 100% and today, my battery voltage fell so much that my engine cut out on me and it barely had enough juice to restart. There is no crud/build up in my cooling system. It's almost squeeky clean. Slightly bad head gasket?