On the link I posted to my earlier thread if you looked at it has pictures of measurements of the intake and the air cleaner side, now this bike was a 1976 DT250C, I know the 1975 is the same, the 1974 is definitely different. So you have a couple of issues one is are you sure the year model bike you have, are you sure your carburetor is the correct model code for a 1975 or 1976 DT250? Last are you sure the vm28/49 on eBay is a genuine Mikuni, they are going for between $100-$125 if you are looking at a $35.00 eBay Mikuni it is not genuine Mikuni. Mikuni vm28/49 that I bought the intake and air cleaner side were identical 34.70mm o.d. on the intake side and 43.86 o.d. on the air cleaner side, probably a discrepancy with my cheap measuring caliper, the Mikuni website lists the specs at 35.0mm o.d. intake side and 44.0mm o.d. on the air cleaner side.

Ok, the ones I was looking at were the cheaper ones.
The price range ones you mentioned appear to be correct.
Thank you so much.
Dan

Pictures of rebuilt carburetor 

     

Pictures of stock Mikuni VM 28/49

     
 

Pictures of Mikuni vm 28/49 with correct jets for a 1976 DT250C, still needs oil injection nozzle installed.

    

I tried the new mikuni with the jets it came with. The bike would not even fire for some reason, the plug got soaked and it had spark. It came with a 200 main.
So I dug around and found a 150 main , put it in, with another plug and after a few kicks it fired up.
I stayed with the pilot jet that came with new carb.
It starts easilly and idles nice. I rode it around the yard a bit (the grass is wet), and got it up to 3rd and all seems in order, runs OK.
Thanks for the tips Lizeec, your info was helpful.
Now when I get laid of this winter I can putter around with making it look nicer.
Dan

I know, pics or it didn't happen..

After the grass dried a bit I discovered (after honking on it a bit) the back brake didn't help stop it. I took it apart and one of the shoes had separated the the friction surface. I dug around my boxes and found a set of shoes. Also the clutch doesn't feel just rite, like some slippage up top. The fibers were crusty and the stills were rusty when I had it apart. I cleaned them up but I may have to replace the fibers. I have a bunch of them lying around somewhere I know.
But the bike started with just a slight push on the kicker, like I do to spin them a few times before I stomp on it to start it so it is set rite I think...
Dan