Walk back through the steps to winterize. If somone used antifreeze in the sea strainers, the lids might not be tight? They could be sucking air.

Yeah, We went to see the Yacht Club...they had an open house, we saw you run out then back in at idle.
Also there is a lot of seaweed at the end of those ramps. I'd back flush your coolers if your running without strainers.
Good Luck, let us know what you find.

I normally float off the trailer but the docks weren't in yet, so I had to power off. I have strainers but I'm going to go through everything when I get a chance. I just hope I didn't damage the motors running them at idle for a couple minutes

An excellent place for my 2nd post.

The 51 that is in for rehab is having this same problem.
I will replace the impellers & housings & double check the "plumbers faucets".

Update:
 

Rotten impellers (all three). Must have burned off the splines by ingesting silt and little pebbles at the launch. I drained the system and there was a surprising amount of debris. I replaced the impellers and now it seems fine. I'll keep you posted

2nd and third post were right then... fortunatly not a big or expensive problem!

:cool:

Thank goodness you found it and it makes sense. Also, a lot less expensive than it could have been!!!