Small Engines (Lawn Mowers, etc.): s200 Toro Snoblower, air mixture, adjustment screw

Question
John, I hope this gets back 2 U. The model is a 2 cycle S200. I have 2 of them...1 works the other doesn't. The 1 that works looks like a newer model (choke is activated by a "turn" knob/ the other 1 has a push/pull cable...This MAY be the source of the trouble...The carbs LOOK the same but the linkages R different! The old one has an idle SPEED adjustment screw, the working one doesn't. Is the correct carb on the non-working one? Doesn't seem like the speed adjustment screw would have ANY affect on the running of the engine. Perhaps someone mounted the wrong carb. on it? Hope U can answer. Both mixture screws are set at 1 turn out! Thanx, Al
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-----Question-----
Found a "complete" model in the rubbish. Took it home as a "challenge". Appears OK, EXCEPT, it had "work order tags" stating that it would "run, then cut out". It had a new carb rebuild kit taped to it. I installed. It'll "catch" when cold, then stops & won't start again. Rebuilt carb. New gas. Lots of spark. Not "sure" which holes to use for idle spring/ governor on carb throttle, but "think" I have correct. Will run if you keep "pumping" the carb primer and/or hold it down. Smokes a little, seems to have fair compression. Head is hardly carboned. Any suggestions? New carb???
-----Answer-----
 Hello Al:

 Send me the Model Numbers Off the Blower and Off the Engine, Please. With these I can Locate a Breakdown/IPL and Better Assist you. It can be the Exhaust Port or Muffler Clogged up or the Valves can be Out of Adjustment. The Carburetor can Also be the cause. Did you Soak the Carburetor Overnight in Cleaning Solution? The Following is the Settings for the Air Mixture Screws. *****The High Air Mixture Screw is In the Carburetor Bowl in the Center of the Nut or Some Carburetors have Both the Low and High Side by Side on the Top Side of the Carburetor. The Screw Closest to the Engine Is Usually the High Air Mixture Screw on this Type Carburetor.The Low Air Mixture is the One at Top on the Side and Goes Into the Carburetor.   Some have the Idle Air Mixture Screw Going Vertically Into the Top of the Carburetor. The Idle Screw is the One that Moves the Throttle Plate. The Following is the Directions for Setting these Screws. **If the Carburetor was Soaked Overnight in Carburetor Cleaning Solution and the Passages Blown Out with Compressed Air and a New Kit Installed,  then we can Set the Air Mixture Screws. Turn Both Air Mixture Screws In Until Seated. **DO NOT JAM  SNUG ONLY** Turn Both Screws Out 1 1/2 Turns. Set the Throttle to Full Open and Start the Engine. Override the Throttle by Pushing the Governor Arm by Hand and Turn the High Air Mixture Screw(bottom of the bowl) In Until the Engine is Revving Properly. Now Slow Engine to Idle. Set the Low Air Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle. Now Set the Idle if Required.**** Hope this Helps. I am here if you Require more Assistance. Let me know what Happens, Please. Thanks.

 Good Luck

 Respectfully

 John


Answer
 Hello Al:

 I Noticed you say the Engine will Run if you HOLD the PRIMER Down. If this is the Case, then Replace the Primer Bulb and Re-Clean the Carburetor. There is a Leak in the Primer Bulb. Also Check the Exhaust Port for Blockage. The Muffler and Spark Arrestor Screen in the Muffler May be Blocked Also. You can View a Breakdown/IPL of the Blower at this Addy https://lookup2.toro.com/partdex/index.cfm?xCaller=Toro. Hope this Helps. I am here if you Require more Assistance. Thanks.

 Good Luck

 Respectfully

 John