As far as I can tell, no ninja 500 engine is a direct fit into any ninja 250 chassis. I've done a 1990 500 engine into a 2009 250 chassis. Definitely not a direct fit. Some people may tell you that it may be a bolt-in affair, but they most likely haven't done it. There should be pictures posted on this thread, but if you need to see more, lemme know.
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