hi guys, i have a 98 yz400f and the top end blew at the dunes this past summer. The piston rod broke and smashed a hole through the side of the jug and took a chunk out of the crank case. Parts for this motor are $$$$ s and i cant fing any 400f motors online. i'm wondering if i can just put a 426 motor in there. as far as i know it will fit but i'd like some more information before i go spending more $$$$. thanks!