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1987 CMX250C AC
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If i'm correct it's shown in all generation parts diagrams..
marked as #1 which includes all rubber o-ring gaskets

appears to be o-ring that seals AF screw, metal washer keeps spring from digging into o-ring.
what it's doing in float bowl is good question.
Ruler Office ruler Wood Rectangle Measuring instrument
 

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1985, 86 CMX250C, 81 CM200T, 74 CL360, Invisible to cages, treat them accordingly. Avoids Road RAGE!
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The O-ring looks too small to be the one on the float bowl???
It sounded like SoakedKarma was correct.
This is all that normally comes with a rebuild kit.
The aforementioned one is what matches. Unless someone errantly put one on the float valve.
 

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1985, 86 CMX250C, 81 CM200T, 74 CL360, Invisible to cages, treat them accordingly. Avoids Road RAGE!
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3,806 Posts
If you look at the picture above for the float Bowl gasket, you'll see one has an O-ring attached to the gasket.
Some carburetors have that O-ring separate, and some have them a fixed as shown in that particular unit.
If yours has the O-ring still attached to the Bowl, it seems like somebody left that part inside the bowl & it shouldn't be there.
 
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VTX 1800, Rebel 250's and 450's, CB1300
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So would it be possible that the washer isnt part of the carb at all and i just found it in the bowl?
It is part of the carb for sure. Or at least, it was.

It indeed is the O-ring for the A/F screw. These O-rings change shape while in place. One side turns tapered, just as the one you are showing here.
 
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