Small Engines (Lawn Mowers, etc.): Governor Linkage Hook Up, air fuel mixture, throttle linkage


Question
As I removed the carburetor from my Craftsman 3hp/9" edger, the governor linkage popped out of the hole in the carburetor. Now I am not sure which hole, or how to hook it back up properly.With the engine stopped, is the governor in it's full advance position when it's at rest? Model #536.797542. Thanks!

Answer
Hello Eddy:

Usually you can See a Wear Pattern Around and in the Hole in the Throttle Valve Control Plate. When the Engine is Not Running the Governor should be in the Full Advanced Position. The Governor System Behaves like an Unending Tug of War between One of Two Governor Springs, which Pull the Throttle Toward the Open Position, and a Spinning Crankshaft, which Tries to Close the Throttle. When the Load on the Engine Increases - a Typical Example is when you Move your Running Lawn Mower from the Driveway to the Grass - Crankshaft Revolutions Drop. But the Governor Spring is Still Tugging, Causing the Throttle Plate to Open. In Response, a Larger Volume of Air-Fuel Mixture Enters the Carburetor, Increasing Engine Speed to Compensate for the Increased Load. The Crankshaft Speeds Up, and the Tug of War Resumes, until a New Equilibrium is Achieved. With Each Change in Load, the Tension Between the Governor Spring and the Load Brings about a New Equilibrium, known as the Engine's Governed Speed. Neither Side Wins until the Engine is Shut Off. At that Point, without the Crankshaft Spinning, the Governor Spring Pulls the Throttle to the Wide-Open Position. Two Types of Governors are Common on Small Engines - Mechanical and Pneumatic. Most of the Newer Carburetors have Only 1 Hole for the Throttle Linkage to Fit Into. Look at the Koles on the Control Plate and you should be Able to See the Wear Pattern where the Linkage has been Working the Throttle Thru Shaft from Earlier Engine Operation. To View a Breakdown of this Unit Go to this Site Addy, http://www.searspartsdirect.com/partsdirect/index.action and Enter the Model Numbers and Click Search. From this Page you can View Diagrams and Parts Lists for you Equipment Using the "View Sub Components" Section Near the Bottom Left. 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

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Ratings and Comments are Greatly Appreciated. Thanks.

Respectfully

John