Thermostat, V6 225 Yamaha

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cwhisen

Cadet
Joined
Jun 30, 2002
Messages
8
I think I have a thermostat problem on my 1994 V6 Yamaha 225 and would like to replace it. I have looked into the themostat and it seems that all it is a spring and a small black plug. Does this sound right and were can I get a replacement? I I went out yesterday and it seems that the Thermostat is staying open. I tested it with a infrared tester after running at WOT for about 8 minutes on lake and then idled around for another 5 minutes and tested and block never exceeded 121 degrees. Is that Normal?
 
R

rbu

Seaman
Joined
Jan 17, 2002
Messages
66
Re: Thermostat, V6 225 Yamaha

A spring and a small black plug ... that sounds like the poppet valve, not the thermostats. The poppet valve is located at the base of the block, there is a water hose attaced to it. If you are used to working on cars, you might think this is where the t-stat is (the housing looks similar). <br /><br />There are two thermostats, one on each cylinder bank, they are located at the top of each bank and are covered by a cover with 4 screws.<br /><br />I can't remember the operating temp for these Yamahas, I think is is around 130-140 degrees. But I could be wrong. Let me know if we are on the same page with the t-stats.
 
C

cwhisen

Cadet
Joined
Jun 30, 2002
Messages
8
Re: Thermostat, V6 225 Yamaha

RBU, We are defintely on the same page and thanks for your help, This is exactly the help I was looking for.
 
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