You might want to take a look at the new QUEST-2. I have one ready to go as soon as the snow melts. The new QUEST is lighter than the old QUEST and will work well with the YS 91.

I had it (the YS 91) in my old Quest and it did just fine. Of course I had to go and put a 1.40L in it for no good reason whatsoever other than ridiculous verticals :-)

Eric.