96 mxz 670 ski doo 6000 miles, need top end rebuild. Should I replace crank seals as well?

Hey, I am in the same process with a 97. Both my pistons are torched Mine has 6700 miles. I am just going with new pistons and rings along with getting it professionally honed .5 mm oversize. Unless you know for sure you have a seal problem I would leave the bottom end alone.