livinmal...Go with the 82 minimum. Many consider a Saito 100 even better. In this class, the Saito is better than the YS63.

My 5 UCD46s have all had RH thrust built in the firewall. I've tried adding a single washer to get more RH thrust and I'm undecided if it's better. With the larger engines I think you need more thrust with the 82 it's questionable. I guess it's not enough better to really make it worthwhile to me. It makes it easier to hover but waterfalls aren't as easy for example. Either way is ok with me.

Anyways, good flying guys.

Thanks
Barry