I have a 1990 johnson 200 and my uncle gave me that boat which it is in really good shape, just been sittin up. I have tried cleaning all the hoses and even replaced the impeller. Someone told me that you didn't need the thermostat so I tried taking the two off to see if maybe they were broke and crunk the motor up, but it's not peeing anything back out. The motor did have some really big ants in it, and I think I have most of them all flushed out, but don't know if there is somewhere that I haven't checked that is causing a blockage or something. Is there anything that might can help me that anyone knows. Any info would be greatly appreciated.