Several years ago (about 20 I think), I read a manufacturers warning letter to marine dealers. I seem to remember that the letter was from Honda to all of their outboard engine dealers. The letter specifically mentioned the three Northern Idaho lakes (Priest Lake, Lake Pend Oreille, ad Lake Coeur d'Alene) as well as Kalispell Lake in Montana. The upshot of the letter was to warn dealers and engine owners who used the engine primarily for fishing or on a sailboat that the cold water and short duration or slow engine speeds did not allow the engines to come up to full operating temperatures. The result was that these engines began to develop carbon deposits in the cylinders. The carbon eventually lead to poor engine performance.
To help prevent carbon building up, the manufacturer recommended running the engines at full throttle for at least five minutes (preferably ten minutes) every month. The engines would come up to normal operating temperature and burn the carbon out of the cylinders.
So, if you have an outboard engine on your sailboat, I'd recommend following the advice of running the engine at full throttle each month.
Pass it on.........
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