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yfz 450 motor in yz250f frame

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Anything can be done if you have enough time and money. Now, is it a wise choice, not really. You would need a wiring harness from a 450, have to have motor mounts changed, New radiatiors to deal with the bigger engine. Syspention will need to be changed for the weight diffrence. If you want big bore power and want to spend a great deal of money. Send your engine to RPM and have a 315 ice cube bore and stroke put in it. Then Send your head to jessie At Williams motoworks and have him dipple your valves and modify your carb for the big bore. You would have a bike that can run down a 450.

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