[LIforrelaxin]

As everyone else here has recommend I would get the new thermostats and put them in. It shouldn't be a big job at all. Engines are always set up to run at operating temperature. Not only is where etc a concern. But timing setting, etc are all based on the engine coming up to temperature. These things are compensated for when the engine is cold.

My guess would be if they thermostats are currently not there, that some shade tree mechanic or early owner removed them when they were stuck shut or only partially opening in the summer. Not a big deal if you only use the boat in late June thru early Aug. but when the weather is cooler you want to be able to heat that puppy up.