I have been looking around for answers to this and have come up short. I want to know if anyone else has a yz/wr 400/426 with the Acherbis 6.6 tank off a WR450 on it. I know that it will require the full yz450 body swap to do. I found 1 picture off a site overseas that looks like someone has done it. The only concerning part would be can you move it up far enough to the neck filler. Here is the picture I found.