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re: Yamaha OX66 250 HP issues - loss of water pressure/cavitation

Posted on 7/1/13 at 4:47 pm to
Posted by greasemonkey
Macclenny Fl aka south JAWJA
Member since Aug 2012
2765 posts
Posted on 7/1/13 at 4:47 pm to
you probably have a plugged passageway in the cooling system.
the foot needs to be pulled and check pump.
If all is good there pull thermostat and check for small pieces of rubber from old pump.

I would prob pull themostat first, cause its easy.

If you see rubber you need to blow out and blow through the piss hole
Posted by lsufishnhunt
Member since Jun 2008
1028 posts
Posted on 7/1/13 at 4:51 pm to
I was thinking along these lines for a while... but the cavitating has me confused. This past weekend we were running through some sloppy seas and the motor would cavitate pretty regularly, then totally lose water pressure. I'd have to come back down to idle before it would pick back up. A clogged passageway wouldn't do this, would it?
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