I have put up with the bum bun syndrome long enough. I have lurked in the shadows reading posts complaining about the stock GL1800 seat. I too have found it uncomfortable after just a couple of hours and miserable after 200 miles or so. I have removed the seat from my bike several times and studied the geometry of it to try and figure out why they are so uncomfortable. I do believe I have the answer.
The foam padding at the back rest is about 2 1/2" thick and is dense foam. About 8" from the backrest moving toward the nose of the seat the pan starts a 45 degree rise to meet the tank shelter. If you are thick bodied like myself the back rest throws you forward and this rise catches the forward part of the crotch. I got some relief by folding a beach towel and building up the seat bottom. I have just today began the process of modifying my own seat. I am taking pictures of the process and will post them later if anyone is interested. So far I have the seat off, the backrest trimmed and seat bottom padding added on rider and pillion area's. I am waiting for the upholstorer to get the vinyl in that I am going to customize the seat with. I am going to keep a picture dairy of the progress. I will have about $180.00 invested and hope to have a great looking and comfortable riding seat. Let me know if your interested in the process in the pic's.
The foam padding at the back rest is about 2 1/2" thick and is dense foam. About 8" from the backrest moving toward the nose of the seat the pan starts a 45 degree rise to meet the tank shelter. If you are thick bodied like myself the back rest throws you forward and this rise catches the forward part of the crotch. I got some relief by folding a beach towel and building up the seat bottom. I have just today began the process of modifying my own seat. I am taking pictures of the process and will post them later if anyone is interested. So far I have the seat off, the backrest trimmed and seat bottom padding added on rider and pillion area's. I am waiting for the upholstorer to get the vinyl in that I am going to customize the seat with. I am going to keep a picture dairy of the progress. I will have about $180.00 invested and hope to have a great looking and comfortable riding seat. Let me know if your interested in the process in the pic's.