swapping engine cases...will it work???

i have an 01 yz 426. ive had nothing but trouble from it. replaced all lower end bearings, and installed wiseco top end. still finding metal shavings in oil and bike seems to be losing power. any ideas???

i can get a bottom end from an 01 wr 426. im pretty sure the transmission from my yz will fit the wr case easily but will everything else work? will the new wiseco piston from the yz along w/ the cylinder and head work on the wr case?

thanks.

The YZ/WR426 crankcases are the same. Everything fits.

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