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2005 YZ250F valve seat replacement

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I just bought a used 2005 YZ250F which would idle. On closed investigation the middle inlet valve has been replaced with a larger valve from another bike due to the valve seat being worn through.

Can these valve seats be replaced and if so where can I purchase them!

Please help as I am not a mechanic.
 

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this is not somthing you can easly do yourself.  you need to send the head out.  Travis at Thumper Racing does a ton of heads and does really good motor work.  661-424-1800.

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How do you know it was replaced?  Did you take the valve off and measure it / see the valve seat was worn, or are you just saying this because it visually looks bigger than the other intake valves?

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