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!