01 426 engine fit an 02 frame?

I would like to use an 01 yz426 engine in my 02 yz426 chassis, does anyone know if I will run into trouble?

I believe I remember that the swing arm bolt is a different diameter between the two. However, this should be correctable by interchanging the two steel sleeves that are inserted into the crankcases, using the '02 parts in the '01 cases. Yamaha lists them as serviceable parts.

Otherwise, the two engines should be virtually identical.

And be gentle removing the steel sleeves. I've had mine out before and they distort relatively easy. I used a brass punch and plastic mallet to knock them out. Insert the punch through the case and knock them out backwards. (if that makes sense).

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