Hey Bob, how are you? Well I hope. After 10 years of trouble free service from my 1997 Yamaha C115 which I purchaced new in 1996, I have got my first problem. I am getting a hot horn above 4000 rpms. Once I get back to idle the horn goes off in about 15 seconds. I went ahead and changed the complete water pump and both thermostats. I took it for a test ride today and it still gets the hot horn at above 4000 rpms. Do you think it could be the thermoswitches (I think that is what they are called)? I removed them from the power head and they are not corroded. I have checked in every possible place for blockage but did not find any. Is there anything else that could be causing this problem? The engine is pretty basic without oil injection and runs great. Thanks in advance, Randall Duhon.