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Revs racing on Vanguard twin 18hp

After starting up the governor arm shifts in to full revs. It seemed logical that there should be a spring to pull the arm back (to oppose the one that pulls it in). I have attached one to the governor arm back to the wire frame around the muffler but it doesn't look like it belongs there. It does work to a degree but the motor seems to struggle with the right amount of revs now. I can't find a manual with a decent diagram of how the governor should be set up. The arm can be pulled back manually without problem and doesn't feel like there is anything sticking but could this problem be caused by something other than a missing spring?

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Down load the manual pdf file from B& S on the model you have.

Posted on Apr 25, 2013

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SOURCE: my Poulan chain saw has a sticking pull cord....r

Check the flywheel and flywheel key. It sounds like the timing is off.

Posted on Apr 09, 2009

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SOURCE: I have 18hp Vanguard it

This sounds like a mixture issue. At the time you pull the trigger, the machine is intended to speed up. I suggest that you get the carb jets adjusted.

Posted on May 30, 2011

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Hi, I have an 11hp briggs and stratton engine on a rancher 2 ride on mower which I replaced. However this engine was given to me and is in excellent condition. I don't know if it had been reringed or


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Try looking at the Governor on the engine. You can usually adjust this out at the Gov arm by loosening and tightening back when smooth. Could also still be dirt in the jets. Make sure all the small holes on he carb are clear and check the float height too.

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1 Answer

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The throttle plate is spring loaded to pull wide open, opposed by the governor which will pull the throttle closer to closed when the limited or specified rpms are reached. If the governor arm does is not connected to the throttle bell crank(linkage broken, off, or missing), it can't pull the throttle closed. If the arm does not move to close the throttle, the governor is likely broken inside the crankcase. or needs adjustment. The internals are a spool that moves based on rpm, pulled up by flyweights that has the external governor arm shaft 'trapped' in between the spool 'ends'. The spool will move the shaft and in turning, move the arm to pull the throttle closed. You adjust the arm on the shaft so the governor can pull the throttle completely closed with all the slack taken up.

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There is an arm that runs from the governor arm to the carb. There should be a long spring on this to even out the revs. If that has come off it can cause similar problems. If you have checked/reset the governor arm on the pinion that comes out of the crank housing and the spring is in place I would think the only other problem is the actuator that operates the governor arm pinion internally. It is a strip down job to check it, but there is a (plastic?) cog that runs of a gear on the side of the crank shaft. This has a weighted pusher that moves with engine speed to move the governor arm. I have seen a couple of engines where there is wear and the weights have popped over the 'top hat' pusher stopping it moving freely and causing full revs. If you're not confident in stripping the crank casing down (you can leave the piston and crank in place to check the governor mechanism) then you should definately take it to a dealer or experienced technician.http://www.honda-engines-eu.com/engines/PartSelection.jsp?model=GX390K1&type=BJ&npl=10ZF601%20&lang=EN
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1 Answer

The govenor rod cannot be adjusted. The springs are intact. Motor revs up but will not idle down. It is 23 HP.


Just guessing here, but if there is no control of the throttle and the engine over revs, then more than likely the governor control is broke. Briggs if famous for that problem. Governor is around 25 dollars and a lower crankcase gasket. Requires the engine to be pulled, lower crankcase removed, remove all pieces of old governor and then re assemble with new governor and gasket.////Before doing all this check that both springs are on the governor on the exterior of motor. If you manually hold the governor arm back, counterclockwise, and it still revs, then you need to replace governor. Don't let it rev for long or it with throw a pushrod or worse. good luck

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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

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