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Old 07-28-2016, 01:59 PM
lil bubba's Avatar
lil bubba lil bubba is online now
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Question No thermostat?

I have a 2007 yamaha 70hp. 230 hrs. 2-3 years ago I had to pull the head and clean the water jacket in the head and replace the thermostat because the jacket was completely clogged. I checked today and the thermostat was gunk'ed up and rusted and the housing for it in the block was gunking up again. I cleaned it up and ran it on hose with no thermostat and it has a lot more flow. The thermostat opens supposedly at 120 degrees. I'm thinking if I run without the thermostat with more flow I won't get all this build up in the water jacket. I never run more than 4 miles one way and figure maybe put the thermostat back in the late winter when the water temp. really drops. Anyone running without a thermostat ??? Anyone know if it will hurt anything to run without one??? I know of 3 other 3 cylinder yamaha's that had this happen so it must occur often and all I can see is because of a lack of water flow thru the thermostat.

Last edited by lil bubba; 07-28-2016 at 02:27 PM.
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Old 07-28-2016, 02:22 PM
Feesherman Feesherman is online now
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Quote:
Originally Posted by lil bubba View Post
I have a 2007 yamaha 70hp. 230 hrs. 2-3 years ago I had to pull the head and clean the water jacket in the head and replace the thermostat because the jacket was completely clogged. I checked today and the thermostat was gunk'ed up and rusted and the housing for it in the block was gunking up again. I cleaned it up and ran it on hose with no thermostat and it has a lot more flow. The thermostat opens supposedly at 120 degrees. I'm thinking if I run without the thermostat with more flow I won't get all this build up in the water jacket. I never run more than 4 miles one way and figure maybe put the thermostat back in the late winter when the water temp. really drops. Anyone running without a thermostat ??? Anyone know if it will hurt anything to run without one??? I know of 3 other 3 cylinder yamaha's that had this happen so it must occur often and all I can see is because of a lack of water flow thru the thermostat.
I ain't had one in my motor for the last 5 years or so.
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Old 07-28-2016, 02:29 PM
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lil bubba lil bubba is online now
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I messed up and put in wrong place . Sorry...
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