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Discussion Starter · #1 ·
I have seen the videos on how to replace and it doesn't look that hard. I am not a boat mechanic, but will to give it a go. I cannot find which thermostat I need.
My yamaha is the TLRV Model, but I cannot find that when looking for the correct thermostat.

What am I missing?
 

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Discussion Starter · #4 ·
I see it being sold 12411-20-00 as New 12441-30-00. Is this the one?
I also will order the gasket. Thanks again
 

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Discussion Starter · #6 ·
So I need to order two of the thermostats and two gaskets. Are they the same number 12411-20-00 New as 12411-30-00?

I would normally take to my mechanic but I might be out of pocket and need to get it done soon. So, I will try it. I will have to find the other thermostat on my motor.

Thanks
 

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So I need to order two of the thermostats and two gaskets. Are they the same number 12411-20-00 New as 12411-30-00?

I would normally take to my mechanic but I might be out of pocket and need to get it done soon. So, I will try it. I will have to find the other thermostat on my motor.

Thanks
They are the same part number, 12411-20. The gaskets will probably tear apart so order those as well. The thermostat housing is on top of each cylinder head. Kind of a squared shape. Find the engine schematic on boats.net or sim Yamaha it will help a ton.

Don’t over think it, very easy job to replace them.
 

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you can break off the aluminum bolts . It is best to move the bolts while they are hot after a day of fishing . just get them to break free and then do them when you have time. a boat thermostat only help you for first 5 minutes on a cold day after that it stays open so most boats in water have a bad thermostat and they are stuck in open position. you can heat them with torch and they should take very little force to move .
 

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Discussion Starter · #13 ·
After I take out old thermostats and replace and tighten nuts back up, is there a re-tightning that I should do after I run it. Or is that all, if no leak is seen. Thank
 

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Discussion Starter · #14 ·
Put two new thermostats in and two new gaskets. Right one did not have any gasket or gasket material on it. The old thermostats did not look that bad, but I probably wouldn't know a good one from a bad one. lol
 

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put it in hot water and it moves and opens up then put it in cold water it will move again.
any bolt that has not been moved over a year is a potential for break so heat them or dont mess with it. I have not change my impeller but I will move the bolts forsure and you can use never seize grease on it as well .
 

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Discussion Starter · #16 ·
The replacement of the two thermostats when great. No issue. Hooray. easy , quick, and simple. Thanks for all suggestions.
 
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