I'm in a bit of a budget freeze now (moving to England in 4 months), but I needed a better solution for hauling the Mrs. around. The stock seat is certainly better for the pillon than the one on my Triumph Daytona, but that isn't saying much. It still slopes forward too much, and doesn't extend far enough. As she slides forward she winds up sitting on the ledge. I suppose I could gain 100lbs so my ass would fill the seat better, but I thought modifying the stock steat might be more prudent.
Despite being almost certain that I was about to permanently fuck up my seat, I embarked on a project to modify it anyway. I used a screwdriver to remove most of the staples (I left the cover attached at the front to make my life easier.) I then pulled out my angle grinder.
The angle grinder does a nice job of shaping foam. It's a bit difficult to control, but if you are careful it cleanly removes the foam, and leaves a smooth surface. I spent about an hour carving out some of the passenger seat foam to make an ass shaped depression. The next trick would be to extend the ledge. I couldn't find a good source of foam, until I stumbled upon knee pads in the garden section of Home Depot. They are just a 16"x8"x1" chunk of foam.
I cut the foam roughly to size with a handsaw. I used spray adhesive to glue this piece of foam in front of the ledge. Using the angle grinder and a hand sander I shaped the foam to match the original contours of the seat. This extended the ledge forward almost 2".
Thankfully the the stock seat cover has plenty of extra material... so all that's left is to restaple it.
I can't wait to try it out... assuming it ever stops raining here.
--Mark