Small Engines (Lawn Mowers, etc.): Tecumseh 5 HP HSSK50 Stalling, central tube, snowblower

Question
Already replaced spark plug, float bowl, O ring, float, needle and seat, and main needle and bowl nut. Set float level as per Tecumseh manual at 11/64". Should I remove the choke and throttle plates? (don't think I have the tool to remount them)
What additional hole did you miss in your disassembly? Should I remove the welch plugs too? Is there anything under those plugs that could cause stalling? The carb is overall very clean. Engine has not had very much use.-------------------------
Followup To
Question -
Hello Mike,
I have a snowblower with a Tecumseh 5 HP HSSK50 that has been stalling about 5 seconds after it starts. Starting is relatively easy but it just doesn't stay running. Priming it durung the stall usually brings it back up to speed momentarily but no way to use it this way. I pulled the carb and replaced just about everything and cleaned it well and now it won't even start. You had mentioned a passage in the stack that could be cleaned with an L shaped tag wire. Which passage is that? I'm unsure of what is meant by the stack. Is it the passage that the main mixture needle seats into? Any ideas on getting me started. Is it OK to test with starting fluid to see if the carb is stil plugged? I do have spark.

Thanks

Brad/ snowy WA

Answer -
Hi Brad,

The carb most likely, still has dirt, debris or gummed fuel inside.  Re-check the carb and look to see that everything that can be disassembled, is.   I don't recall mentioning a stack.  Maybe it was another expert. Some carbs do have a central tube that usually clogs up.
I have had to re-do a carb several times just to find that I missed one small plugged hole.   Adding a carb rebuild kit wouldn't hurt either.  Sure, you can try to start it with starting fluid or squirted fuel, to confirm.

Let me know how you make out.
Michael  

Answer
Hi Brad,

You shouldn't have to remove the plates or the welch plugs.
The holes that I missed were, once in a removable central tube and another time, in the side of the main needle jet.  These were old larger carbs that I had not seen before, where I rushed the inspection and cleaning.  If you get to the point that there is nothing left but carb replacement (Which is sometimes for unknown reasons, the only remedy.) then I would check under the welch plugs, as they can possibly clog.   
Another thought is the loss of venting or clogging in the tank.

Michael