Couple of things to check
3.Carburetor Adjustment. A carburetor that's incorrectly adjusted is a common cause of poor engine idling that results in hunting and surging. ... Then slowly adjust the screws tighter or looser in turn until the mower runs and idles smoothly.
this first..When the blockage moves or clears, the engine may suddenly rev up in response. To fix this type of problem, check the air filter to ensure that it's not clogged with dirt and debris. Check the vented gas cap as well. Both issues can cause reduced or sporadic air flow, and clearing them will fix the problem.
2.Water in the fuel will do it too.
sorry i posted them not in the right order.
SOURCE: Briggs and Stratton 17HP Intek Governer Overspeeds
Can you Regulate the Engine Speed Using the Governor Arm? If Yes, 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.** If you Can Not Regulate the Engine Speed Using the Governor Control Arm, then Check the Carburetor Throttle Valve. If the Throttle Control Valve (sometimes called a Flap or Plate) Mounting Screws Came Out of the Control Valve, then you will have No Control Over the Engine Speed. Send me the Model and Type or Spec Numbers Off the Engine, Please. With these I can Locate the Proper Manual and Better Assist you. **The Throttle Cable Attaches to the Throttle Control Bracket. The Cable Moves a Slide that Moves a Pivot. The Pivot has the Spring Attached to it and to the Governor Arm. The Solid Link Connects to the Governor Arm and goes to the Throttle Shaft on the Carburetor. When the Throttle Cable is Moved it Moves the Pivot and the Pivot Pulls the Spring. The Spring Pulls the Governor Arm and the Governor Arm Moves the Throttle Shaft. Usually the Spring is in the Lower Hole in the Governor Arm and the Solid Link is in the Top Hole of the Governor Arm.** 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
SOURCE: briggs and Stratton mower engine carburetta
you can download a manual for it here
http://www.briggsandstratton.com/maint_repair/manual_and_more/doclist.aspx?category=Engines&manual_type=Operator%20Manuals&menu=nav3&subMenu=3
SOURCE: New Craftsman 20hp Briggs & Stratton 42
first make sure the air intake screen on top of engine is not clogged with debris if thats not a concern you could have a faulty ignition coil etc your engine should have a two year warranty and can be serviced at no charge to you at your local briggs service dealer make sure and check your manual for the fine print though. Briggs makes a great engine and very rarely have I ever seen a problem allthough if you were to have an engine issue it will accur during the first few hours of opperation good luck
SOURCE: 24 hp Briggs Stratton sears
If the mower starts and continues to run after injecting, you may want to make sure the choke is working properly. If the choke plate is not closing all the way, it will make cold starts difficult.
Testimonial: "thanks for the help the choke was open just a little"
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