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Yz 125 float needle seat.

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I am wondering what the spec/measurement is for the float needle height is supposed to be. It's a 2011 with a mikuni carb. Have gas pissing out if the overflow when on stand or sitting with gas on. Any tips and tricks are also appreciated!

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Sometimes the O-ring under the float valve (#11) can get torn or aged so that it doesn't seal off the fuel flow -- even when the valve is closed.

http://www.yamahapartshouse.com/oemparts/a/yam/51c88071f870022090da8151/carburetor

It's pretty easy to check visually, and replacements can be found at most hardware stores. The posts below may be helpful as well.

Good luck, and keep us updated with what you find. 👍

 

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I have had the issue with the print for the seat being the issue.

 

after you check that go to this post 

 

I have a picture posted of how to set the float from a 03 rm125 manual 

 

it will work just fine for setting your float

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Have you tried polishing the brass seat ?

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