Opti 200, brief overheating problem...
The Optimax 200 on the Boston Whaler I use has just started overheating, but only for a brief period before all is fine again.
It's just after you fire it up, and run it for a few minutes at idle or low revs in the harbour. The temp gauge rises quickly (to over 150-160F) then safe-mode kicks in, but only for a about 20 seconds before the temp falls very quickly down to 115F then settles at it's normal temp of 120-130.
I'm thinking it's a sticking thermostat? The water pressure is fine and the impeller was replaced at the start of the season. At high revs, or even at low revs after the initial overheat it's all fine
Any help appreciated, I take it the stat is a straightforward swap?