Small Engines (Lawn Mowers, etc.): Engine runs fast, Kohler, Governor

Question
Have a Craftmans 18 HP lawn tractor Model 917.272420with a Kohler Model No. CV492-27506 engine .We were mowing the lawn when all a sudden the engine started to run at a very high RPM . I took the carb in to a repair shop and they cleaned it for me. But the engine still races , was able to adjust the low idle down to be able to use tractor. Am looking for any help you could give me. Thanks.

Answer
Hello Jack:

>>Sorry for the Delay. This Question was Located in the Question Pool. I am Also on Vacation and I had a Few Minutes to Answer Questions.
>>From your Description it Sounds like the Internal Governor has Broken or the Governor Arm has Slipped on the Governor Shaft and Requires Adjusting.
>>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, Put the Linkage in  a Bind when the Carburetor was Removed or if you Suspect the Governor Arm has Slipped on the Governor Shaft, 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.**
>>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.**
>>Please, Do Not Hesitate, If  I Missed Something or 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. Be Safe and Be Happy. Thanks.


Good Luck


Respectfully


jbridger (John)