Small Engines (Lawn Mowers, etc.): engine fails to idle or run slow, grounding wire, valve seat

Question
Tecumseh, H30-35387S. Acquired troy-built tuffy tiller from my father.
Engine will only run at max with ½ choked.
Cleaned carb with no change.  Installed new carb from Outdoor Dist.
Engine still  runs at max and only at 1/2 choke. Dies (almost like a kill switch) when unchoked or throttle is minimized the least little bit. (throttle grounding wire is disconnected).


Answer
Hello Henry:

What is the Compression? If Less than 80psi, then the Engine May have Idling and Running Problems. Using the Choke Makes the Low Suckson (due to low compression) to Draw Enough Gas to Run, even Though Not Properly. Low Compression can be Caused by; 1- Bad Rings. 2- Burnt Valve or Valve Seat. 3- Sticking Valve. Did you have the Governor Arm Disconnected from the Governor Shaft? If Yes, then Reset the Governor First.  If you Removed the Governor Arm to Remove the Carburetor, then Reset the Governor. **To Reset the Governor; Loosen the Governor Arm Bolt and Turn the Governor Shaft Clockwise Until it Stops. Using the Governor Arm Hold the Carburetor to Full Throttle. Now with the Shaft Full Clockwise and the Governor Arm and Carburetor Held at Full Throttle, Tighten the Governor Arm Bolt. If the Engine Still Runs Full Throttle, then Reverse the Rotation of the Governor Shaft, but Still Hold the Carburetor at Full Throttle with the Governor Arm. If it Still Runs at Full Throttle, then Check the Internal Governor.** You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.outdoordistributors.com/ and Select the T. Then Select Tecumseh. Then Select Don't have Part Numbers. Then Enter the Model Numbers. Then Select your Model and Download the File for Online Viewing. 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