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Engine Only Runs Wide Open!


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#1 GTpicker01 OFFLINE  

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Posted April 08, 2014 - 07:53 PM

Hey guys,

I have a 1990 wheel horse 212-5 that has a vertical shaft 12 horse briggs and it only has one speed and that's wide the heck open! I took it apart and and looked at the governor gear and the the cross shaft but they both were fine but I replaced the gear anyway just to be safe. Well I put it back together and still have the same problem. I don't think it's a fuel issue but at this point I'm lost. Any help would be appreciated.

 

Thanks!



#2 petrj6 ONLINE  

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Posted April 08, 2014 - 07:58 PM

   Is the throttle stuck open?  have you cleaned the carb?



#3 DennyIN OFFLINE  

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Posted April 08, 2014 - 08:07 PM

Adjusted the governor?



#4 GTpicker01 OFFLINE  

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Posted April 08, 2014 - 08:18 PM

Throttle isn't stuck I've cleaned the carb and I've tried adjusting the governor but it still only runs wide open.

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#5 superspeedex OFFLINE  

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Posted April 08, 2014 - 08:25 PM

its only runs wide open or its dies when you try and make it idle grab the butterfly and move it that will tell you your problem



#6 dropped82 ONLINE  

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Posted April 08, 2014 - 08:27 PM

The governor on those Briggs is extremely sensitive to adjustment. If adjusting it doesn't help its possible the internal portion is the problem. Ibdont know much about Briggs but on kohlers its a gear running off the cam.

Eric

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#7 GTpicker01 OFFLINE  

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Posted April 08, 2014 - 08:36 PM

I already replaced the gear on the inside and the cross shaft wasn't broken. I can't make it do any other speed than wide open tho. There is no idle.

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#8 Chopperhed OFFLINE  

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Posted April 08, 2014 - 08:46 PM

First off, make sure all the linkages are moving freely.  make sure the butterfly operates smoothly. Make sure the mixtures are set correctly.

 

If you've moved the screws on the carb, with no effect, then the carb needs a serious cleaning.

 

Even if it ran 6 months ago, bad gas breaks down fast, and will plug the tiny little passages in a carb.

 

If all the other suggestions have no effect....

 

Rebuild the carb and fuel system , and don't run it any more until you do.

 

The running wide open issue is a sure sign of an extremely lean condition. Continued operation under that condition will result in a dead engine. Quickly.



#9 Rock farmer OFFLINE  

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Posted April 08, 2014 - 08:48 PM

Has it always been like this. or, did this just start?
First guess, either too much fuel or too much air.
Could be wrong carb?
How about a little history?

Joe

#10 GTpicker01 OFFLINE  

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Posted April 08, 2014 - 08:57 PM

Well I got it from I guy who has always had this problem he was gonna junk it so I said I would take it. He claims he was mowing grass and it just went wide open and nothing else. That's why I thought it was the governor gear. But the carb appears to be original.

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#11 jdslednut OFFLINE  

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Posted April 08, 2014 - 11:08 PM

It still sounds like a static governor adjustment would be a good thing to try again.  Not to point out the obvious, but I've had many students adjust it in the complete opposite direction creating quite the commotion in the shop.



#12 HANKG OFFLINE  

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Posted April 09, 2014 - 05:22 AM

I WOULD JUST GO WITH IT IF THAT HELPS; JUST JOKING, GET A REBUILD KIT OR CLEAN CARB REALLY GOOD MAY HAVE DIRT CAUGHT IN IT.

Edited by HANKG, April 09, 2014 - 05:21 PM.


#13 GTpicker01 OFFLINE  

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Posted April 09, 2014 - 06:53 PM

Guys I found the problem and I felt extremely stupid after I found it. The throttle flapper inside the carb got sucked into the intake valve after the screw came out. I have no clue how I missed that while I cleaned it. Anyway I got the flapper out of the valve and it was still usable. So I put it back on and the tractor runs great now. I learned a little something today.

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#14 wku88 OFFLINE  

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Posted April 10, 2014 - 08:56 PM

Did you also find the screw? If it's left in the cylinder, it can cause quite the problems.



#15 SearsYellow OFFLINE  

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Posted April 10, 2014 - 09:20 PM

That's crazy. I'm glad you found it before any damage was done.


Edited by SearsYellow, April 10, 2014 - 09:34 PM.

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