DR 350 stuff for sale:
I have a Mikuni TM-34 carb and throttle assembly for sale. I paid $250 from Thumper Racing (they sourced it from Sudco). Price on carb, intake manifold adapter, Motion Pro (Magura-style) throttle, throttle cable (including delivery): $75. This carb is best if you have a big bore kit installed (Thumper didn't tell me that before selling it to me). it is very similar to the Dirt model carb, but has no accelerator pump.
I also have a large Clarke "desert-style" tank. I have a 92 DR 350s and it interferes with the OEM throttle cable. If you have a dirt carb or a carb with the cable going directly to the slide you should be fine. Price (including delivery): $75
I also have an Answer SA-4 aluminum exhaust muffler (weighs a LOT less than the OEM) that I will TRADE for a OEM stock muffler (in good shape) plus $60, shipping included. The sound level is about 94db, which is quieter than most aftermarket pipes, but I want to go as quiet as possible. Wish I hadn't junked my OEM muffler, but my loss is your gain.
lastly, a 13 tooth countershaft sprocket (by Sprocket Specialists, I think) in excellent condition (lower gearing than factory) $5 with any of the above items.