replacing thermostat 1996 yamaha 150

mmas261

Cadet
Joined
Aug 9, 2002
Messages
12
My 96 yamaha 150 picked up some sand today and my pee hole kept clogging up with sand and small shells. Everytime I went over idle it would clog again and the overheat alarm would go off. I ran clean water through it at home and it had a good hard stream. I also took out the thermostats and they had a lot of shells in them so I will replace them. Can I put the housings on and run the engine to flush any remaining sand before installing new thermostats? Should I also replace impeller and water pump as well? I have never done them before and only owned the boat for 6 months so I don't know the last time they had been changed. After I pulled the thermostat out I noticed pretty good salt build up inside the cylinder head housing. Should I rebuild the cylinder heads or is this normal?<br />Thanks in advance,<br />Mike
 
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