Fighting with one of these for a Super 250. No primer, it's the model specific choke carb.
I'm a little stumped. I have a Sugar Creek kit for it, but I can't get it to pass fuel. I am tempted to play around with gasket stacking like Mark did, but of the 6 times I've tried, only once have I managed to get fuel to the pump chamber and beyond and I am unable to identify why it worked that one time. At no time, however, have I been able to make the saw run on anything other than a shot down the bore. Runs like a champ for 4 seconds when I do that! Just enough to tease me. In addition to the gasket stack, I have concern with the fuel filter pressed into the bottom. For now, that part is resting in a carb cleaner dip tank overnight to see what happens. I'll eliminate that problem source if all goes well tomorrow. I can make air go through evey passage on the carb, no blockages I can identify. I have not pulled the welch plugs only because I don't have any... yet?
Getting good with this thing. I can go from spread on the bench to installed test and back out to spread on the bench in under 5 minutes...
A few pictures. One thing different (besides the choke in place of the primer) is the metering seat is pressed in, not threaded.
Sugar Creek Kit like the OEM.
Casting on the front. I assume it was made in October 1973.