Wisconsin AENLD runs too fast

fnorthrup

New User
I have a Wisconsin AENLD engine on an Ariens TA20 tiller. It fires right up, but will not idle down. I have completely replaced the carburetor and nothing changed, so it is nothing to do with the carb. All linkage and governor adjustments are correct. Any help would be greatly appreciated.
 

if everything is fine on the outside like you say the only thing it can be is your governor internally. Could be one of the flyweights broke free, only way to find out is pull the motor and see.
 
Thanks for your reply. I admit I do not fully understand how the governor works (I probably will before this is over). Here is what baffles me. When the engine starts up, it
goes right to wide open apparently. It is new to me so I am not used to listening to it run, but it sounds wide open. It apparently does not have to do with the throttle. The
carb is brand new and the throttle and idle jet are adjusted per the factory. When I move the throttle by hand, it has little or no effect of the RPM's, it keeps right on
racing. Would a faulty governor do this without moving the throttle connection? Thanks again for your help. I want to be sure before tearing the engine to pieces.
 
When you "move the throttle by hand and it has little or no effect of the RPM's"....are you actually moving the lever at the carburetor?

Because if you are moving the lever on the carburetor to the idle position and it's still racing it would have to be one of two things. Either a vacuum leak, or the idle screw is screwed in too far not allowing the butterfly to close.
 
Right. I am moving the throttle lever at the carburetor. I set the idle screw before installing the carb so that the butterfly is barely cracked open. It is definitely not that. Is there a common source of vacuum leaks on these engines? Thanks again Jay for your help.

Fred
 
I currently have a pair of AENL's (1959 ~ 9.5 hp), and have never had this problem.

If the butterfly is being held in the idle position, this has nothing to do with the governor.

So, the vacuum leak has to be somewhere "prior" to the butterfly. Possibly an intake gasket, and hopefully not a "CRACK".

You definitely want to find the problem before things go "bang".

Good luck,
Jay
 
The carburetor is a new Zenith carburetor. I simply followed the included instructions to set the idle before installing. I then adjusted the governor linkage according to the Wisconsin manual. Anyway, I will try adjusting the idle down, however I am afraid that Jay is correct. Since the intake manifold gaskets are newly cleaned with new gaskets, I fear the worse. Maybe find out spraying around with a can of starter fluid? Thank you for the help fellas. Greatly appreciated.
 
A butterfly that is "barely cracked" will not allow an engine to rev to wide open throttle! Air has to be getting to the cylinder from another opening.
 
1. Starts right up, no problem.
2. Runs too fast and very rough.
3. Adjusting the carb and moving the throttle on the carb seem to have little or no affect. It has a main jet and idle jet.
4. I took the top shroud off today and sprayed starting fluid around the manifold and head. Nothing.
5. Took it out to the garden, runs pretty nice under load. Tills and pulls as though it is pretty strong. It simply will not idle down no matter what I try, and runs very rough. Something is not right.

Question. Could it be a timing issue?
 
What I meant was that a "barely cracked" butterfly ALONE would not allow the engine to rev, and that there must be another opening (or crack) allowing air into the combustion chamber.

The fuel is obviously coming from the carburetor.

I would not continue to run the engine under these circumstances....there is a problem that won't fix itself.
 
OK. Did I mention that I was a novice, a greenhorn mechanic? This is for all those novices that may read this post. The Wisconsin AENLD engine as mounted on a Ariens TA20 rototiller has a breather tube that goes behind the carburator and attaches to the intake under the air filter. That tube got bent just a little, somehow, and would not allow the throttle butterfly to close. (My apologies to the guy who sensed that this was the problem). It is very difficult to see as the throttle attaches behind the carb, against the engine. After much agony, searching, irritating my forum friends, adjusting the governor spring, searching for vacuum leaks, I finally noticed, observing with a flashlight that the idle adjustment was not even coming close to the post. I thought, what the.....? Do I have a stray nut jamming the butterfly? I removed the carb, it worked fine. I bolted it back, it would not return to idle. Finally after looking and scratching my head, I realized the throttle on the carb was coming up against the breather tube. I put a bar in there and bent the tube up just a little and.....presto, the engine runs like a kitten. Idles right down, revs up and tills like all get out. The governor works fine, all is well. I can't tell you how good it feels. Thanks to you fellows who helped me rule out what the problem was not.
 
Glad to hear you have it figured out. It REALLY had me curious to see what you found, as I knew something was not right....just didn't know what.
 

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