Are you sure something is holding it on and its just not STUCK. If you took the bolts out and cant move it its just stuck, if you moved it enough to un-mate from the surface then something is holding it. If its stuck tap it a few times with a rubber mallet to unseat it. If something is "holding it" I would try a couple firm pulls directly towards you perpendicular to the bike. IF something is holding it it would most likely be from straight on (like a shaft or something) so pulling it directly towards you would be the safest way IMO. Call Yamaha and ask the techs.