QuestionQUESTION: Hi John,
I have a Murray Lawn Tractor with a 12.5HP Briggs & Stratton motor, Model 28V707 Type 1113-E1. For some reason I can not get this engine to idle. I have adjusted the governor both ways and no matter what the carb throttle stays wide open and I have done everything, today to get it to idle I made a cable bracket from scratch to get direct control over the carb linkage, I now have good carb linkage control, however when I accelerate using the cable the motor has a slight hesitation and back fires threw the carb.
Maybe I should just shoot this thing, LOL.
Do you have any suggestions to fix this problem?
Thank you for your time and help,
Darrell
ANSWER: Hello Darrell:
The Poping Back when Revving the Engine the Way you have the Throttle Rigged; the Engine will Backfire 75 to 85% of the Time. From your Description, it Sounds Like the Internal Governor has Broken. Replace the Internal Governor. 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. Remove the Oil Pan. After All the Oil Pan Bolts are Removed; Tap Lightly on the Sides of the Oil Pan to Loosen it from the Dowel Pins. When the Oil Pan is Removed, you can See the Governor Resting on Top of the Cam Gear. 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 So it is Resting on the Governor Shaft and Carefully Replace the Oil Pan. Remember to Replace the Oil Pan Gasket. 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. These Instructions are Basic. Your Internal Governor May Differ. You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.smallenginepartswarehouse.com/parts.asp and Select the Shop Online Parts Look Up. Then Select the Model Tab. Then Select the OEM and Enter the Model and Type Numbers (first 4 digits Only). Then Double Click on the Model in the Results Area. Now you can Select the Section of the Engine you Wish to View. 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. 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. Thanks.
Respectfully
John
---------- FOLLOW-UP ----------
QUESTION: Hi John,
I fixed my throttle control cable back to stock control and replaced the governor arm control spring. The motor is ideling better, however the motor has a slight surge to it, the motor accelerates and the governor pulls the throttle back toward idle, I think that governor action is normal, but then I could be wrong.
I have a question about the exhaust system. I would like to modify the muffler a little to quiet it down some, how would a modified muffler effect the performance of my motor?
Thank you for your time and help,
Darrell
AnswerHello Darrell:
The Surging is Usually Caused by the Carburetor Jet Being Restricted and Not Allowing Enogh Gas Into the Engine through the Carburetor Jets. Remove, Disassemble and Soak the Carburetor Overnight in Carburetor Cleaner (I Use Gunk). I have Found that Most People can Use a Breakdown/IPL and Disassemble the Carburetor Enough for Proper Cleaning. You Only have to Remove the Bowl, Float Pin, Float and Needle Valve and Any Adjustment Screws that Go Into the Carburetor Body. The Welch Plugs Do Not have to be Removed. Then Soak the Carburetor Body and Parts in a 1 Gallon Can of Gunk Carburetor Cleaner Overnight. The Can has a Parts Tray Inside it for the Small Parts. Once the Carburetor and Parts are in the Cleaner, you can Replace the Lid for Safety and to Prevent Accidental Spillage. Then Blow Out the Passages with Compressed Air. Install New Parts if Required. I have Modified the Muffler Systems on Many Mowers and have had No Problems with the Engine or Equipment Operation. 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. 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. Thanks.
Respectfully
John
