Small Engines (Lawn Mowers, etc.): Toro S 200 Snowblower, air mixture, air screw

Question
Ben, I have a 1976 snow master S-200 that will not stay running. Model # 31506 1976 serial range 6000001-699999.  Carb. # 631887.  I Soaked and cleaned up carburetor, bought a rebuild kit. I did everything I could think of.  Brought re-built Carb to Toro Dealer/Mechanic up town he said everything looked fine.  I put it all together, it will not run.  I can get it to fire, but not stay running.  I spray choke cleaner in carb it then starts runs for about 15 secs. and dies.  I am at wits end.  It has great spark. I would greatly appreciate any help you could give me.  By the way last year it always started on first or second pull.  Thanks Again, Scott.

Answer
Hello Scott:

Sorry for the Delay. This Question was Located in the Question Pool. You can View a Breakdown/IPL of the Mower at this Site Addy, https://lookup3.toro.com/partdex/default.cfm and Select Start Parts Viewer. Now Enter the Model Numbers (31506). Now Select View Assembly Drawings. I See by the Breakdown that this is a 2 Cycle Engine. Have you Removed the Muffler and Inspected the Exhaust Port for Carbon Blocking the Exhaust Port. Check the Muffler and Spark Arrestor Screen (in the muffler) for Blockage Also. If the Exhaust Port or Muffler is Blocking the Exhaust you will have the Problem you Described. Are the Carburetor Mixture Screws Set Properly? ****All the Carburetor Adjustments are the Same for Lawn Mower and Trimmers. There are Several Location for the Air Mixture Screws. The Idle Air Mixture Screws are Usually Located at the Top of the Carburetor Bowl and the Top of the Carburetor Body. If the Main Air and Idle Air Mixture Screws are Side by Side on the Side of the Carburetor, then the Idle Air is the Farthest from the Engine. The Main Jet Air Mixture Screw is Located in the Bottom of the Carburetor Bowl or Beside the Idle Air Screw on the Side of the Carburetor Body. Some of the Older Model Carburetors have the Main Jet Mixture Screw Straight in from the Top of the Carburetor Body (this is Rare anymore). If you have Cleaned the Carburetor (Disassembled and Soaked Overnight in Carburetor Cleaner (I Use Gunk). Then Blow Out the Passages with Compressed Air and Install a New Kit if Required. Now Setting the Air Mixture Screws:  ****Turn the Idle Air and Main Air Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Holding the Throttle Full Open, Start the Engine. Turn the Main Air Mixture Screw Clockwise Until Proper Revs are Obtained. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs. Now Allow the Engine to Idle. Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required. Now Set the Idle Air Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.**** If you Hit a Snag or this Does Not Correct the Problem,  I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Thanks.

Good Luck

Respectfully

John

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Respectfully

John