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Briggs engine revving high


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#1 BrokenTractor OFFLINE  

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Posted May 23, 2017 - 11:32 AM

Hello,

 

I just went to start the riding mower with a briggs & stratton 14.5 hp engine and it is trying to rev high.

 

As soon as I noticed that I pulled the choke out to slow down the rpm's. 

 

1.) So for the fuel/air mixture screw I need to turn it what way? CC means less air for mine.

 

2.) Does the high speed idle screw having anything to do with it?

 

3.) I noticed the very thin wire was off the carb and the rod within a 1/16" next to it was off as well. So I put them back on. I believe

both of these are for the choke.

 

Then there is another rod that attaches to the throttle lever that controls low speed thru high speed ( in theory ). This never came off recently.

 

So for a high "revving" engine what is the problem?

 

Thanks,

BrokenTractor

 

 



#2 firefight100 OFFLINE  

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Posted May 23, 2017 - 12:15 PM

Hopefully this manual will help you out more than anyone's simple answers to your questions.  You should be able to find a similar carb/governor section in here.  Also make sure your throttle shaft is working and not stuck open first.

Attached Files



#3 dtsh OFFLINE  

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Posted May 23, 2017 - 12:16 PM

Did you check your springs, such as from the governor to the throttle linkage? It sounds as though you may have serviced the carb before this, yes?

 

Does the engine surge, revving high then low, then repeating? Does it rev up to a et point and seem to hold there or appear to just keep going faster and faster?

 

Has any work been done on it previously which may be related?

 

 

Edit: firefight100 beat me to it.  :P


Edited by dtsh, May 23, 2017 - 12:17 PM.

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#4 BrokenTractor OFFLINE  

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Posted May 23, 2017 - 01:29 PM

aaaa.jpg

bbbb.jpg

 

I will add any notes to these 2 pictures if need be. Also I am very grateful to you folks that understand these engines far more than I do.

 

 



#5 Bud W OFFLINE  

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Posted May 23, 2017 - 01:34 PM

It looks like the governor rod is bent a little and may bind up. 


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#6 BrokenTractor OFFLINE  

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Posted May 23, 2017 - 01:44 PM

bbbb2.jpg

 

Thanks Bud,

 

and normally the part circled is off to the far right? And only on max throttle it moves to the left?

 

Thanks,

Jim


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#7 BrokenTractor OFFLINE  

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Posted May 23, 2017 - 01:55 PM

touch.jpg

 

The only other question I have is, "is A ever supposed to touch B?"

 

I mean when you throttle up say full A and B never touch are they supposed to?

 

Thanks,

Jim



#8 BrokenTractor OFFLINE  

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Posted May 23, 2017 - 02:09 PM

Hello,

 

I just watched a video:

 

 

at 6.00, the author says basically, "see how that bar spins up there? It comes in contact with the choke lever right here."

 

OK on my engine that never happens. Might be the main problem or another problem.

 

Edited: It might be the case that A and B are irrelevant because I have a separate choke lever?

 

Jim


Edited by BrokenTractor, May 23, 2017 - 02:25 PM.


#9 Hellbent OFFLINE  

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Posted May 23, 2017 - 06:06 PM

If it acts like it revs with no end it may need a static govener adjustment

#10 James Bosma ONLINE  

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Posted May 23, 2017 - 10:16 PM

It looks like the governor rod is bent a little and may bind up. 

Looks same to me too

 

2nd pic in post 4 looks like linkage is bent up

Straightening the rod will add more length as well and should run slower



#11 secondtry OFFLINE  

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Posted May 23, 2017 - 11:41 PM

attachicon.gifbbbb2.jpg

 

Thanks Bud,

 

and normally the part circled is off to the far right? And only on max throttle it moves to the left?

 

Thanks,

Jim

   OK The parts circled are the governor arm and the throttle linkage. At present time the throttle is being held wide open by the governor arm. If the throttle control on the dash is in the slow position it should take very little effort to push the throttle arm to the left sufficiently to close the throttle plate in the carburetor. When the engine starts the throttle arm should move to the left turning the throttle plate towards the closed position. The only time you should see the governor arm in its present position is when the engine is not running or when the is under maximum load. If the engine starts and the governor arm remains in its present position either something is binding and stopping movement, the throttle control is grossly out of adjustment or the governor is defective. The Parts you have labeled A and B are part of the automatic choke and should have little effect as they are being over ridden by the added on manual choke linkage some one has installed. Don  



#12 BrokenTractor OFFLINE  

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Posted May 24, 2017 - 01:46 AM

    The Parts you have labeled A and B are part of the automatic choke and should have little effect as they are being over ridden by the added on manual choke linkage some one has installed. Don  

Don thanks for clearing this up for me. 

 

Jim



#13 BrokenTractor OFFLINE  

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Posted May 24, 2017 - 05:04 PM

Thanks to all that posted. I put everything back where it belongs and also some liquid wrench and just sprayed mainly rotating parts on and around the carb.

 

Put most of it back together except the base air cleaner and the engine ran very well. No more "revving".

 

aircleanerbase2.png

 

Jim

 

 

 

 


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#14 dtsh OFFLINE  

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Posted May 25, 2017 - 12:31 PM

Thanks to all that posted. I put everything back where it belongs and also some liquid wrench and just sprayed mainly rotating parts on and around the carb.

 

Put most of it back together except the base air cleaner and the engine ran very well. No more "revving".

 

attachicon.gifaircleanerbase2.png

 

Jim

 

Sorry if I misunderstood you, but I hope you aren't leaving the air cleaner off as you'll suck up grit and grime which will grind up your piston, valves, etc reducing the life of the engine significantly.

 

If leaving that off has solved the revving issue, I'd look to see if it's bent somewhere or missing a part such as a grommet and interfering with the linkage due to misalignment.

 

 

Edit: I presume you checked to ensure the air cleaner isn't blocked up with crud.


Edited by dtsh, May 25, 2017 - 12:32 PM.





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