ok still messing with my 02 mach z it says that the coupler blocks should be centered between the two stops when the rear spring tention is set up right with the riders weight well im turned all the way up to #4 the stiffest setting for a fat boy and when i sit on it it still goes all the way down and hits the stop on the coupler block so i have checked and none of the shafts are tied up im good about maintainace on my stuff i have new rear shock and stock 5000 mile old rear springs. do i need like 2 up springs as im 310-315 and the highest setting on the skidoo decal shows 280 lbs on setting 4 ?if i need bigger springs where do i find a part # ?as once i order them im stuck with them they need to be right.as soon as i set on it its like compressed all the way and its a kind on rigid ride.when it comes back up too it comes up kind of slow not as fast as my wifes 02 mxz700 or our legend 04 fan 550 yea the suspension looks diffrent i think the other 2 are sc10-3's?i think mine is sc10-2?so whats the problem with the slow rebound and the all the way back against the stop deal with the coupler block???????? they say centered is set up right when you set on the sled? i just set down on the seat easy let alone move up and down like your hitting bumps and its all the was back hitting the rear coupler block stop and sitting low to the ground?????does the front shock have anything to do with this?? as i have not took this apart yet and removed the spring from it and looked at that shock yadayada or is it a waste of time??when i watch my buddys polaris next to me when we are riding its moves all the time up and down my stays low and his also rebounds pretty quick when you get off of it mine dont why????IS THE SPRINGS JUST TIRED OUT AT 5000 MILES.EVEN WHEN I GET OFFF OF IT ONLY RETURNS BACK UP LIKE 90% OF THE WAY IT DOES NOT COME BACK UP ENOUGH TO HIT THE FRONT STOP ON THE COUPLER STOPS IF I PULL UP ON THE SLED IT COMES BACK UP THE OTHER 1 INCH OR SO AND STOPS AGAINST THE STOP THEN???IM PUZZLED HERE