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Air Cut Off Valve (Diaphragm) compatibility

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Does anyone know if the XR250 Air cut off valve is compatible with the XR400R?  They look the same to me.  I can't find the XR400 diaphragm for less than $50, but the XR250/XR600 are around $20. The part number is different, so maybe that means they aren't swappable. 

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Looks like just the diaphram isn't available alone. The kit is $45.32 at both RMATV and Service Honda.

If you're desperate, you could use some fuel resistant RTV on it. I've seen guys here do that.

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I had to replace my air cut off valve on a 98 honda xr250, K&L Supply Air Cut Off Valve Set 18-2796

 http://www.klsupply.com

at the time back in 2015, I remember looking at their catalog and them having the valves for tons of different honda carburetors...  maybe thats different now, I tried to look at their catalog and could not find it in pdf form. they have it on you tube which was annoying to use. good luck. 

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I had this same issue with my 98 XR400 and found that a 2004 CRF230F diaphragm fits. Pulled it out of my daughters bike to double check.

Search for K&S Technologies Carburetor Air Cut-Off Valve Set 56-1005. 

Found it on Amazon for $20.08.

Hope this helps.

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