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i too just did this a few months back to my stock 91 sporty two up seat. i didn't really have any instructions to go off of so i just started pulling staples to rip off that old vinyl and get the foam exposed. i second the idea about shaving down the foam with an electric carving knife. however, i used my 10" fillet knife and it worked great as long as i sharpened it often. I didn't mess with the shape of the plastic seat pan although i probably should have and definitely could have. I took quite a bit of foam off the top and sides and got the nice low profile shape i was going for (kinda like a cobra seat). The foam on your finished shape doesn't exactly have to be super smooth as long as its all uniform and symmetrical. Recovering it will smooth out any minor imperfections. I didn't even consider re-using my old vinyl it was so trashed so I went to the fabric store and bought some upholstery grade vinyl, synthetic batting (for a little bit of puff) leather needles and heavy uv resistant thread. Next I got a quick lesson from my mom in law on how to work a sewing machine and went to town tuckin' and rollin'. I used a little pneumatic finish nailer with 1/2" staples in it to recover. I stapled the front first, stretched it kinda tight and hit the back then zig zagged left to right starting in the front. I'll try and dig up some of the photos i took. It's definitely not a professional upholstery job but i got a new seat for about $40 and the more stuff you have on your bike that you made yourself the better. I personally love what I did with my seat and kind of want to buy another crappy stock seat for cheap and do it again. Just figure out the look you want and jump in head first. It's super fun.
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