I just bought a 2002 Xpedition 425 that is stuck in 3rd. Last night I discovered it actually has a 2000 325 engine in it. That makes the decision easier if we want to attempt tearing it down ourselves to see what's going on. Now, if that doesn't work, do any other engines fit in the Xpedition frame? I think I read somewhere that a 500 cylinder will fit on the 425, but does any other engine assembly fit? Thanks in advance.