QuestionQUESTION: I have a 25HP Scotts riding mower. When I start it, it runs wide open. I'm guessing that my problem is the carb? Any suggestions welcome.
ANSWER: Hello Dennis:
>>When you Move the Governor Control Arm, Does the Engine Speed Change?
>>For Better Assistance, Send me the Model Numbers Off the Mower, Please. With these I can Locate the Proper Manual and Better Assist you. The Model Numbers are Usually Located Under the Seat (Ride On Mowers) on a Sticker or Tag on the Body. Examples: Honda Model Numbers; HR194 PXA, HRB215K2 SXA, ect. Example: Sears Model Numbers; 123.123456 .
>>This Problem is usually caused by the Throttle Control Valve being Stuck, the Throttle Control Valve Flap being Sucked into the Engine and is No Longer Inside the Carburetor Throat/Manifold and Must be Replaced, the Governor Arm has Slipped on the Governor Shaft and Requires Setting, the Internal Governor is Damaged and Requires Replacing.
>>The Following is an Instruction File I Made for Setting the Governor Arm Correctly. Any Input is Appreciated.
>>If you Removed/Loosened the Governor Arm from the Governor Shaft or Put the Linkage in a Bind when the Carburetor was Removed, 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 (if you are sure the Throttle Control Valve Flap is Correctly Installed and Working), then Check the Internal Governor.**
>>If you Hit a Snag or this Does Not Correct the Problem, I Hope to be Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Happy. Thanks.
Good Luck
Respectfully
John
PS: I am Allowed to Answer 3 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. Comments and Ratings are Greatly Appreciated. Thanks.
Respectfully
John
---------- FOLLOW-UP ----------
QUESTION: Governor control arm does change engine speed.
I have not removed the carburetor.
The model # is Scotts 50570x8A 25HP Briggs & Stratton Intek twin cylinder overhead valve, dual-barrel carburetor.
Hope this helps. Thank-you, Dennis
AnswerHello Again Dennis:
>>Follow the Instructions for Setting the Governor Arm.
>>Since moving the Governor Arm Does Change the Engine Speed, then Either the Governor Arm has Slipped or the Internal Governor is Damaged.
If Setting the Governor has NO Effect, then Replace the Internal Governor.
>>The Following is a Basic Instruction File for Examining the Inside of a Small Engine and will Assist you in having Access to the Governor, Oil Pump (if Applicable), Cam and Crankshaft Gear. Any Input is Appreciated.
>>**This is a Simple Process. Drain the Oil and Remove the Engine to the Work Bench with the Oil Pan Facing Up. I have a Wooden Rest that was Especially Made to Hold the Engine when in this Position.
>>Using Fine Sand Paper, Remove ALL the Rust and Debris from the Crankshaft.
>>Remove ALL the Oil Pan Bolts.
>>After All the Oil Pan Bolts are Removed; Tap Lightly on the Sides of the Oil Pan to Loosen it from the Dowel Pins.
Sometimes you May have to Use a Flat Screw Driver or Chisel Between the Oil Pan/Sump at the Areas Neat to the Dowel Pin and Loosen the Oil Pan/Sump.
>>When the Oil Pan is Removed, you can See the Governor Resting on Top of the Cam Gear.
>>****If Required: Lift Off and Replace with a New Governor. Check the Engine Block for Debris from the Old Governor and Wipe the Inside of the Block With a Rag, Until Clean. Set the Governor Shaft So it will be Resting on the Governor whine the Oil Pan is Replaced and Carefully Replace the Oil Pan. If the Crankshaft Seal Was Not Leaking, then Leave it Alone. It Should be OK. You can Easily Replace it While Mounted on the Machine if Required Later. Make Sure the Governor Stays in Contact with the Governor Shaft while Replacing the Oil Pan. Re - Mount the Engine to the Machine. Refill With Oil. Your Internal Governor May Differ.**
>>You can View a Breakdown/IPL of the Engine at this Site Addy; http://www.briggsandstratton.com/maint_repair/manual_and_more/ and Enter the Model Numbers and the Type Numbers(XXXXXX-XXXX-XX) in the Appropriate Box and Click GO. Then Select Download PDF.
>>As Always, If you Hit a Snag or this Does Not Correct the Problem, I Hope to be Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Happy. Thanks.
Good Luck
Respectfully
John
PS: I am Allowed to Answer 3 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. Comments and Ratings are Greatly Appreciated. Thanks.
Respectfully
John
