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XR400 with YZ450f silencer?

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Hello all.

Just wondering if anyone has tested running the silencer of any other bike on the XR400. Have been searching but not found as much as I wanted to about this subject.

Anyone know the outer diameter on the header where it connects to the silencer? (Cant measure mine cause its at a friends house at the moment.)

The reason I am asking is because one of my brothers has got a silencer of a YZ450f that I can get almost free. It looks like it could fit but as the bike isn't at home I cant test it.

So, does anyone have any answers to these questions?

Edited by mattiasnowak

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The 250fs will have the smaller mid pipe size that will mate up to the 250/400 bikes more easily. You will need need to weld on the connection between the header and exhaust but turns out well. Also the 250fs will have a smaller core thus a bit less sound.

I run a 09-11 kx250F pipe on my xl250f. The bends were closest to stock.

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I mounted a KX250F silencer on my XR250L, just cutted the mount (grinded the markings) and welded where I needed it and the mid pipe was cut/bent to fit my 250. Its so doable. I believe the 400 is easier since there is more room between the subframe and the mounting hole so more place to position the can. good luck

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