Dirt Tracker Seat Pan

[SmokeAddicted]

I saw the "317 Hyams" at Barbor this past year, and decided this is the styling I wanted to explore. Such a great looking bike if you happen to catch this thread.

That said, I bought this seat off EBay yesterday. Searching through Google images, this exact seat pan shows up a lot on flat track builds. A couple of Moto Carerra bikes as well.

I want to replace or upholster the padding, but I suck at upholstry. I'm hoping someone can tell me who made these fiberglass seat pans/rear cowls, so that I may be able to locate a better looking pad. One covered in vinyl vs open foam.

My guesses are Saddleman? Moto Carerra? Was there a well know craftsman that made these in the past? They all look identical but I cannot find who made them.

[SoCal250]

Moto Carrera offered a fiberglass seat called the XR seat, which was a replica of the XR750 seat. They were made by SGS Composites (which is long gone) and sold through Racers Supply and Moto Carrera (both of which are long since closed). It looks like that's what you have. Doug used them on his Del Mar Special flat tracker & Latigo Canyon Special custom builds. (In the bike photos you posted the 3rd bike is a Latigo Canyon and the last is a Del Mar Special.)
For a pad you're going to have to get one custom made. The common pad back in the day was closed-cell foam, but I do recall Doug offering a custom vinyl covered seat on his tracker builds that was made by Saddlemen.

Similar seats based on the XR750 design are available elsewhere:
Glass From The Past
Airtech is now gone but their parts catalog is being produced now by Gustafson Plastics
Gopher Glass

[SoCal250]

A few pics of Doug's builds from his shop. Steve Fuentes is the guy who did the work in the shop for Doug

Del Mar Special in front of Doug's shop in North Hollywood






Latigo Canyon Special

[RDnuTZ]

back in the day Doug was advertising looking for R5s to buy to build the trackers. I had a rolling chassis with lower end I offered him. He sent Steve down to fetch it in San Diego and I believe that frame became #3 or #4 of the Tracker series. I was hoping to see some for sale over the years as they really appealed to me (before I had the $ to buy) but have never had a shot at 1 since I could afford it   

[teazer]

The short answer to the original question is to remove the foam and clean up the base.  Then cover it with a layer of reasonably thick plastic or apply a generous coating or two of mold release and lay s couple or three layers of fiberglass and resin on top. When it has cured, remove what is not the new seat base and trim it to size.  get a piece of foam cut to match the seat pan and take it to an auto upholstery place to get the cover of your own design made and stuck or stapled to it.

Attach velco to the seat base and seat pan to hold them together.  Done.

[SmokeAddicted]

A few pics of Doug's builds from his shop. Steve Fuentes is the guy who did the work in the shop for Doug

Del Mar Special in front of Doug's shop in North Hollywood






Latigo Canyon Special

That is epically cool! Really appreciate you sharing those. It certainly explains why nearly every bike I've seen with this tail fairing has a 750 tank.

Whoever owned it prior to me, decided to build in the hardware so that it functions like an OEM seat pan. The only problem is that it sits way too high on the frame rails and looks a little silly relative to the tank.

The 750 tank is also something I'd like to purchase, however it looks like it requires some heavy modification based on what I've seen. Also a seemingly very rare tank these days. Deadbeat(?) Customs is the closest re-pop I can find.

[m in sc]

glass from the past offers one as well, i know they -used- to offer upholstery service as well. they wind up on a lot of XS650s as well.

Not my cup of tea, never was, but there are lots of options, and maybe theres an upholstery option on one of those you can just buy standalone? 

[SmokeAddicted]

The short answer to the original question is to remove the foam and clean up the base.  Then cover it with a layer of reasonably thick plastic or apply a generous coating or two of mold release and lay s couple or three layers of fiberglass and resin on top. When it has cured, remove what is not the new seat base and trim it to size.  get a piece of foam cut to match the seat pan and take it to an auto upholstery place to get the cover of your own design made and stuck or stapled to it.

Attach velco to the seat base and seat pan to hold them together.  Done.

After toiling over it for a couple days, I've thought about using 1/8" thick thermoplastic as a rigid base, shaping some foam, and paying an auto upholster to cover. As simple as Velcro sounds, I wouldn't have otherwise considered it. Appreciate the advice.