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Runs at full speed only cannot adjust carb govenor at full speed

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See if there is a Philips-head set screw on top of the carburetor (it is the idle speed adjusting screw) that you can turn counterclockwise backing off the idle (and possibly the wide-open throttle) speed. This is the simplest solution for you unless you wish to remove, disassemble and inspect the carb. Also, check the throttle cable to the carb, make sure it is not hanging up or binding near the engine where it connects onto the throttle plate shaft of the carb.

Posted on Sep 06, 2010


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When trying to generate electricity, it stalls. Oil level good and carb has been cleaned thoroughly. Linkage for auto throttle up is moving like designed. Any thoughts?

will assume it a petrol not a diesel

that govenor is adjustable
with all the load and vibration and use
sometimes that govenor adjustment will need a twig

lever moving up and down is a good sign
does it need a spark plug
or valve adjustment
if all that is ok
if you push that lever slowly full forward and motor stalls
may tell you its govenor needs a twig

Oct 08, 2016 | Electrical Supplies

1 Answer

ADJUST THE GOVENOR ON MY LT 155 John Deere lawn tractor

This should be Kawasaki engine; although, it could a Kohler. The IPL on this doesn't specify which engine it has. It would nice if it did where I could look the engine's service manual but the following should be what you need.

You place throttle in full throttle position. You need to watch the linkage at the governor shaft for which it turns as you go to full throttle then you would continue turning the governor shaft in that direction until it stops. From there you tighten the retaining bolt or nut and you should be good to go.

Nov 08, 2014 | John Deere Garden

1 Answer

Lawnboy Commercial Mower - idle speed adjustment

did you have the governor arm off of the motor

Jun 06, 2013 | Garden

1 Answer

I have an old tecumseh 10 hp eng model vm100. with carb problem

Rigid link to the top hole on govenor arm, spring link to second hole. If engine 'hunts', try the 3rd or 4th hole. Each lower hole will take off a few rpm, but make the engine less prone to 'overshoot' the goverened speed.

If you have not disturbed the govenor arm clamp where it fixes to the shaft that goes into the engine, that should be all you have to do if you have, proceed as follows ;-

Assemble as above. With engine OFF, loosen the govenor clamp. Push the end of the govenor arm so the carb throttle is wide open. Whilst holding it there, rotate the shaft in the same direction as the arm would have rotated it if you hadn't lostened the clamp. Ensure it's rotated as far as possible (this removes ant 'lost' movement in the internal govenor mechanism.). Now tighten the clamp and release everything. Push the speed control to FAST. The throttle should open, and it will requirer about 4 OZ of force on the end of the govenor arm to close the carb throttle. This force will be generated by the govenor when the engine is started

Move the speed conrol to SLOW. Most of the tention should disappear, allowing the throttle to close with very lettle pressure on the govenor arm.

If all this behaves as described, you should be safe to start.

May 11, 2010 | Garden

1 Answer

Engine races

One thing I read is that on some the arm from the govenor shaft can slip on the shaft so the arm is rotated on the shaft to a point the govenor isn't even in contact with the internals driving the shaft. On those units a clamp bolt becomes loose causing the problem.

I suspect if there IS an internal problem it is severe and one would have to disassemble the engine before operating it lest damage occur from loose parts.

Mar 24, 2010 | Briggs & Stratton Power Products 5,550...

1 Answer

How to set govenor on a briggs 10hp ohv 204412-0156E2

You should do an inspection of the governor linkage and spring before start, it should be in full fuel and move easily by hand.

Governors tend to not just go bad or even out of adjustment.

Is your real problem a clogged carb?

This would leave the Governor in full fuel and still starving for fuel.

If so remove carb, flush and clean the high speed jet adjust needle valve all the way in back out 1.5 turns and it should run normally again.

Hope this tip helps.


Jan 17, 2010 | Coleman Powermate Premium Plus 6250W...

1 Answer

Engine will not run at steady speed, govenor continually fluctuates , This engine is a Kawasaki FC420V-ES10 on a John Deere Riding Tractor Model LX176. I tried the mixture adjustment needle valve no help.

On top of carb you will see a jet that is slotted,remove with screw driver and use a very thin wire to clean out hole in jet.Some had a black metal clamp holding it in place,remove that one by removing phillips screw,black clamp then use small pliers to pull jet out of top side of carb.If this does not work remove carb bowl and jetting in bottom-center of carb and clean jetting holes with a small copper wire.The mixture screw is for low speed air/fuel mix,this engine does not have a high speed fuel screw.Fixed jet.

Dec 11, 2009 | Garden

1 Answer

Starts then runs full speed. tec 6.5 on toro personal pace

First I would check the carb and make sure the throttle plate has not come loose from the throttle shaft. If it has there is a small screw missing which should be retrieved if at all possible. Also check the springs on the throttle linkage to make sure they are not in a bind.
If the carb checks out and nothing is hung up then you can adjust the running speed by bending the tang that holds the fixed end of the throttle spring. bending towards the carb and loosening the spring will slow the motor and away from the carb/ stretching the spring will increase speed.
If you have slacked the spring and the motor continues to run fast then it needs a govenor adjustment.

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1 Answer

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It could be the linkage from the govenor to the carb, maybe the throttle shutter is stuck. Try WD 40.

May 17, 2009 | Toro Lawn Mower With Toro Power Tools

1 Answer

Engine speed throbs

Unscrew the screw on the bottom of the carb until is runs right, if their isn't one use the lowest adjustment screw on the carb.

Mar 17, 2009 | Garden

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