I took my formula z to a ski doo dealership yesterday to have it looked at (im guessing that was a mistake) anyway we couldn't get it to idle it would just die. it runs great from 2000rpm to 4500rpm then when you hit 5000 it bogs down and wont keep climbing. the previous owner had it rebuilt and it only had 80 miles on a fresh rebuild. the dealership had it compression tested and said one head had 90 and the other had 120 I find it hard to believe that its blown piston and ring wise with only 80 miles on a rebuild. what are your guys thoughts??? I was told that it my just need a new set of head gaskets?? they say those go bad on rebuilds sometimes?? any help would be great!!