I put the HD EPI springs on my '03 600 twin on the front and back and noticed an improvement initially but the rear end still seems to sagging again. The handling in the front is much improved. I know I can adjust the rear springs stiffer, but I didn't want the ride quality to change. Any chance that bad shocks could also be contributing or is it that I need to adjust the springs stiffer and go on a diet??

If it is the EFI model switch to the Marroon (PATV10) or the Red (PATV1) primary spring and the Almond secondary (PEBS5) springs. Sorry for the slow response I have been out of the office a lot.

I recently installed a clutch kit on my 06' 500 EFI Sportsman with EBS. I installed the pink primary spring and the black secondary, but am thinking i want to put the mudder springs in which color of springs for them. I also installed the new Helix and new weights that came in my kit.