YZ400F 99' Bottom End?

Hey, my brother is/has been looking for a 'bottom-end' for his bike. I'm just curious on what years would be compatible with a 99 YZ400f,and maybe some suggestions on where to find them, for a decent price. He wouldnt mind spending a little bit more money, if he KNEW the bottom end would actually hold up for a while instead of just getting him through the summer or something. He's looking for along-term fix, Any suggestions or tips are grealy appreciated. Thanks!

The best long term fix is to rebuild the one he has.

you cant do any better on long term reliability than OEM parts.

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