Just bought a -79 Yamaha 6hp. Cooling water coming out from housing is very poor at cold engine and when it warms up, there no water at all coming out. Becomes grey smoke instead and I don't dare to run any longer. Changed to a new impeller today - same result. <br />If it's clogged, where to start dismount?<br />Does this engine have a termostat/where?
You will get the best awensers to your question if you post it on the outboard engine forum..