I'm going to say no on both, but you can make anything work if you really want it to.
The 250R mounts on the a-arms are too wide for the 400EX frame to accept them. I've heard of people going the other way though. Using 400EX a-arms on 250R frames, but they would have to shim the a-arm mounts. The stems do not interchange.
__________________ 1986/2007 TRX250R
LSR/Custom Axis Project Underway...
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