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Hi , I just purchased a 2000 model 17 ft. Boston Whaler with a 90 hp Yamaha 2 cycle, I've only ran this engine for a one hour trial and it runs great! My question is should I change the water pump , this engine has spent most of its life in storage.
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M19,
As long as you are getting good water pressure and no alarms going off to indicate an overheat condition, "don't worry 'bout it" [img]smile.gif[/img] .
Most owners change out the water pump on an average, I would guess, about every three years - depending on use, of course. Since your Yammie has few hours, it probably can go another year or two before water pump repair.
You might consider adding a water temp gauge, or better yet, a water pressure gauge to monitor the performance of the pump.
Plugged into the head of your motor is a device called a thermo switch. It has a bi-metallic strip in it that "bends" when heated - and on the ends of the strip are contacts that will close at around 180 degrees and signal the CDI that an overheat condition exists. The alarm will sound, and a few seconds later the CDI will go into an rpm reduction mode by cutting back on the spark - the motor will drop dramatically in rpm and shake like it's hitting on one cylinder.
That's a wakeup call that SOMETHING IS WRONG.
Ok, I've already told you more than you wanted to know, so I'm gonna shut up now [img]smile.gif[/img] .
Good luck,
Ken K
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