450R motor in 250X

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:

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.

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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