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450R motor in 250X

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Hey guys, I am having some engine problems and was wondering if it'd be possible to drop a CRF450R motor in my CRF250X? Would it just drop in? Is that at all possible? Thanks guys!:bonk:

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Hey guys, I am having some engine problems and was wondering if it'd be possible to drop a CRF450R motor in my CRF250X? Would it just drop in? Is that at all possible? Thanks guys!:bonk:

I'm sure it'll fit, but I doubt its a drop in. The 450 motors usually have different engine mounting. You would probably have to fabricate mounting brackets for the frame. You'd also lose the starter.

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The 450 motor is larger physically, much taller. If you ever tried to replace the engine on a 450 you'd swear that it doesn't even fit into the frame it belongs in. IMO this would be extremely difficult and not worth the effort.

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