1999 yz 400, what engine will fit?

i have a 1999 yz400 and the motor was blown when i got it, cases cracked and the whole works. i want to put a different motor in it but don't know what will fit. any help would be very appreciated, thanks

You can put another 400 in it. A 426 motor might fit too, maybe even a 450 motor with some frame mods....

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