QuestionQUESTION: John,
I have John Deere L118 with a Briggs & Stratton (Intek 22-hp) 407777-0131-E1 (041201YG) with just 50hrs on the clock.
It starts fine and will idle all day, but increasing the throttle has no effect. A couple time it stumbled a (very) little when all way at full throttle. The throttle cable/linkage is connected ;-) and can reach down the horn and feel that the throttle plate is moving (opening) when the throttle lever position is changed. If I push on the low speed adjustment it revs up and I can feel some push-back which I assume is the governor. I assumed I had a clog somewhere in the carb, question is where? Where is the high-speed fuel circuit I should be looking for? I pulled off the float bowl and checked the solenoid and it retracts nicely when power is supplied. I blew out everything accessible (needle passage, jets in the emulsion tube, etc) with carb cleaner. I also did the same on the opposite side of the carb by removing the cover plate and blasted those passages with carb cleaner. Put it all back together and no change....
Could it be possible that it is a fuel pump issue?
This model has a vacuum pulse driven fuel pump. The vacuum tube is OK, but when I pulled the tube completely off the fuel pump, there was NO difference in how the engine ran!?!
Idle fines, and still no high speed.
Thanks for any input!
ANSWER: Hello Roger:
If you can Rev the Engine Using the Idle Adjustment Arm, but the Throttle Lever Does Not Change the Engine Speed from Idle; then Check the Throttle Control Spring. **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 the Other End of this Spring Attaches 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.** You can View a Breakdown/IPL of the Engine and Mower at this Site Addy, http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.H and Enter the Model Numbers and Click Find. Then Select your Model from the Search Results Area. Then Select the Sectional File. Then Select the Section of the Mower you Wish to View Online. 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. Thanks.
Respectfully
John
---------- FOLLOW-UP ----------
QUESTION: John,
???
**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 the Other End of this Spring Attaches 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.**
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I see nothing like this on this Intek V-Twin engine
There are 2 springs on the governor; One is the idle spring and the other the throttle restrictor spring, but I see is NO spring(s) attached directly to the throttle linkage.
What I see is... The throttle cable end is attached to a pivot which moves a solid link that is attached directly to the pivot on the side of that carb, (that pivot being attached to the throttle plate shaft “in” the carb.)
I thought that I must have lost a spring, even though I could not see anywhere one would attach to the throttle linkages, from the cable end all the way to the (throttle shaft) pivot on the side of the carb.
Anyway, I went down to the local Lowes and took a look at a John Deere with the Intek V-twin and it looks the same has mine – NO spring attached to the throttle linkage.
Call me stumped!
Roger
AnswerHello Again Roger:
I Apologize for the Confusion. I Notice I Sent you an Explanation for the Single Cylinder Throttle Control Set Up by Mistake. On your Linkage there is Still a Spring the Pulls the Governor Arm from the Control Bracket Linkage (it may use another link to connect to the Governor Arm, but it is there). Have Someone Operate the Throttle Lever. Watch the Linkage Move. There is a Spring that Pulls the Link that Connects to Governor Arm to the Linkage. The Spring is a Governor Spring. 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. *If this Spring has Broken or Jumped Off, the Throttle Cable will Not Move the Governor Arm or Linkage Controlling the Governor Arm.* 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 (Full Throttle) Position. Two Types of Governor are Common on Small Engines - Mechanical and Pneumatic. This Engine has the Mechanical Governor. I Looked at the Owners Manual for this Engine and Did Not Locate a Picture of the Governor Linkage or the Throttle Control Bracket Linkage. I Hope the Explanation of How the Governor Functions will Help you Locate the Problem with the Linkage. 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. Thanks.
Respectfully
John
