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Old 02-16-2019, 09:09 AM
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Join Date: Jun 2008
Last Online: 02-16-2019 09:15 AM
Location: Plano, TX
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Default Carb Drain Bolt Leak

     

Hello
I procured a YZ 250F that sat for a long time. The carb was a mess and needed extensive cleaning. I soaked the bowl and all the gunk came off, it is sparkling clean. When I reassembled it gas was flowing out of the bowl drain tube (not an overflow hose). I have cleaned the bowl and the drain bolt several times and it still drains gas out the tube. In the shop manual it does not show any seals and the bolt just blocks off the drain when it seats but mine never does. The drain bolt has no gouges or nicks that might prevent it from sealing. I have never seen this before. Whether the drain bolt is loose or tight, it still leaks.

Any suggestions?


Thanks.

Last edited by mboyd; 02-16-2019 at 09:15 AM.
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Old 02-16-2019, 04:43 PM
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Join Date: Jul 2011
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Location: Benton, LA
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Default

It has an oring.
Go to any oem parts site on line and look it up. That o ring is part of it.
https://www.bikebandit.com/oem-parts...5160#sch528753
Part number 4MX-14561-00-00

That carb and part were used on many carbs of 4 strokes bikes for many years. You can even order the drain plug and the oring as one part off e-bay as well.

Paw Paw

Last edited by PawPaw; 02-16-2019 at 04:50 PM.
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