When it's time for a tune up for my 97' mariner 25hp 2-stroke and I replaced with brand new impeller, selenoid, stator plate, new NGK sparkplugs, rebuild/cleaned the carburator, clean the waterjacket gasket and reseal it. Everything run great like it is before and something is missing in my mind and it's a thermostat check-up. So I took the thermostat off and it's looks like it need a new one. I ordered a new thermostat for my motor. But.....I was told by a guy and marine mechanic that I don't need to run with thermostat in it. He has a 30hp johnson 2-stroke without a thermostat in it and ran so many hours on it. So I put it back without a thermostat in it and the motor pump the water a lot cooler when it's idling in the tank but never ran it wide open. Is a good idea to run without a thermostat or not?