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Briggs Twinn Ii Will Only Run Flat Out


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#1 New.Canadian.DB.Owner OFFLINE  

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Posted May 26, 2013 - 06:13 PM

I have a Briggs Twin II (422707 1214 01) in a Turf-Trac 1848 (MTD 140-848-000) that will only run at 3600 RPM.  The throttle lever does not adjust the speed, but it is not over-speeding.  It starts fine and will slow down if choke is applied.  Choke & throttle cables are not crossed.  The throttle cable does move all of the linkages, but possibly less than desired (full cable movement is 3/4" vs 1 3/8"), but speed does not change over that range.  I've done the throttle cable set up as per the engine manual (throttle at full & governor control swivel pegged).  I've done the governor static adjustment (lever & shaft fully counter-clockwise).  I just can't get it to slow down any.

 

Feel free to assume the PO messed with the entire throttle system.  He liked to "make thing work" as opposed to "make thing work correctly".  

 

throttle adjustments.jpg

 

Linkage      

1.jpg 2.jpg

 

Engine not running - throttle at slow                     Engine running - throttle at slow

off - slow.jpg                                    running - slow.jpg

 

 

Engine not running - throttle at fast                      Engine not running - throttle at fast

off - fast.jpg                                     running - fast.jpg

 

 

 

 

 


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#2 hamman OFFLINE  

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Posted May 26, 2013 - 06:34 PM

Are any of the linages bound up? Maybe bound during its travel space. JM2CW. Roger.


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#3 Amigatec OFFLINE  

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Posted May 26, 2013 - 06:37 PM

On my 11.5 B&S on my Snapper RER, when it does that the carb has the main jet plugged. It's normally because water has gotten in the float bowl and has caused rust.
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#4 crittersf1 OFFLINE  

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Posted May 26, 2013 - 07:29 PM

On my 11.5 B&S on my Snapper RER, when it does that the carb has the main jet plugged. It's normally because water has gotten in the float bowl and has caused rust.

:iagree: :iagree: :iagree:



#5 New.Canadian.DB.Owner OFFLINE  

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Posted May 26, 2013 - 07:40 PM

Two votes for plugged main jet, but won't that cause the engine to run slow (or lean), not fast?  The tractor runs fine and moves under it's own power without slowing the engine even a bit.

 

The linkages are not binding.


Edited by New.Canadian.DB.Owner, May 26, 2013 - 07:40 PM.

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#6 MH81 OFFLINE  

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Posted May 26, 2013 - 09:45 PM

If you manually close the butterfly, is there a change in RPM's?
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#7 chris m OFFLINE  

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Posted May 26, 2013 - 10:21 PM

In your second picture marked "Linkage" I see the throttle stop screw away from the linkage ( fast position), does the linkage hit the throttle stop screw when you put the control in idle position? 


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#8 Amigatec OFFLINE  

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Posted May 27, 2013 - 02:01 AM

Two votes for plugged main jet, but won't that cause the engine to run slow (or lean), not fast?  The tractor runs fine and moves under it's own power without slowing the engine even a bit.
 
The linkages are not binding.


I mowed my grass like this, as long as it was running full throttle, it ran just fine.
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#9 New.Canadian.DB.Owner OFFLINE  

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Posted May 27, 2013 - 07:23 AM

MH81: I'll try that & report back.

 

Chris M: Yes, when the control swivel is at idle, that lever is at the low speed idle screw.

 

Amigatec: I guess I have a carb cleaning in my future.


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#10 Amigatec OFFLINE  

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Posted May 27, 2013 - 08:03 AM

I've had this happen twice and both times it was water.

I hate to remove it from my Snapper, because its hard to get to.
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#11 New.Canadian.DB.Owner OFFLINE  

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Posted May 28, 2013 - 05:49 PM

Amigatec was right.  Crud in the main jet.  

 

Dirty carb.jpg

 

MH81: No, moving the butterfly had no effect on engine speed.


Edited by New.Canadian.DB.Owner, May 28, 2013 - 05:51 PM.

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