You didn't say what year (or what size), but I own an early '03 400 FSE and had to do a complete top-end rebuild this past winter thanks to drowning it in a massive mudhole. The entire job was performed with the engine still in the frame. The seat, tank and shrouds were all I removed (and the entire exhaust...best to put this back on all at once, loosely, then tighten everything up). I did have to loosen the subframe and rotate it slightly on the lower mounts to allow enuf space to get the throttle body out.
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