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Wisconsin Engines Single cylinder up to V4 engines.

Wisconsin Engines

Why won't it start? Wisconsin AENL


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  #1  
Old 03-20-2009, 09:11:48 PM
jumpinjivinjoe jumpinjivinjoe is offline
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Default Why won't it start? Wisconsin AENL

I have 1 cylinder Wisconin AENL in an Eonomy (Power King) tractor. I rebuilt it, and it will not start. It has spark. It has gas (though the carb could be screwed up, it should at least sputter with starting fluid or WD-40). I lined up the marks on the crankshaft with the marks on its corresponding gear and I lined up the marks on the magneto with its corresponding gear. So what else could possibly be the problem as to keep it from starting? Does the crankshaft need to be turned over 1 revolution, so that it lines up with the marks on the next revolution?
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Old 03-20-2009, 09:26:35 PM
Zira Zira is offline
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Default Re: Why won't it start? Wisconsin AENL

Did you check for a fat blue spark? That is the most likely culprit. Make sure that the points are clean & capacitor is good.

If you are concerned about the ignition timing, turn it over slowly by hand (easier if you take out the spark plug) and make sure that the impulse snaps when the marked fin on the flywheel is at the 12:00 position. If it does, you are in business. Otherwise, recheck your timing marks on the crankshaft & cam shaft gear. Some gears have 2 marked teeth, with the mating marked teeth going in between. It is easy to get off one tooth.


Is the comression good? On an AENL it should be difficult to turn over by hand.
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Old 03-21-2009, 01:58:53 AM
jumpinjivinjoe jumpinjivinjoe is offline
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Default Re: Why won't it start? Wisconsin AENL

Yes I have a blue spark.
The compression is great.
The magneto snaps and makes the spark right at TDC, each revolution.
As you can see I am confused as to what is causing my problems. Perhaps I could advance the magneto up one tooth.
What else could be the problem?
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Old 03-21-2009, 07:04:14 AM
Jimmy Jimmy is offline
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Default Re: Why won't it start? Wisconsin AENL

With my AEN (the predecessor to your engine), I often have a hard time starting it because of carb problems. Most of the time the float is stuck, but once in a while I will find foreign material blocking something.

When the float is stuck, I can usually tap the carb bowl with a mallet, which frees it up almost all the time. And then it starts (for me).

That's all I can think of this morning. I haven't had breakfast.
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Old 03-21-2009, 09:36:08 AM
Arlie Levy Arlie Levy is offline
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Default Re: Why won't it start? Wisconsin AENL

IT sounds like you are 180 degrees out of time. Make sure you are on the compression stroke at top dead center when the mag fires. Arlie
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Old 03-21-2009, 12:10:42 PM
Jimmy Jimmy is offline
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Default Re: Why won't it start? Wisconsin AENL

Quote:
Originally Posted by Arlie Levy View Post
IT sounds like you are 180 degrees out of time. Make sure you are on the compression stroke at top dead center when the mag fires. Arlie
Wisconsins fire on every revolution (I thought). On my AEN, correct timing is whenever the keyway is straight up, the impulse cupling should snap.
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Old 03-21-2009, 09:33:59 PM
jumpinjivinjoe jumpinjivinjoe is offline
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Default Re: Why won't it start? Wisconsin AENL

Originally I thought it was a revolution off, but upon futher inspection it does fire every revolution.
I did not buy a carburetor rebuild kit, I just cleaned it up and used the old gaskets; So the carb could be screwed up, but regardless, shouldn't it at least "cough" or fire once or twice with starting fluid?
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Old 03-22-2009, 12:15:41 AM
bill chasser bill chasser is offline
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Default Re: Why won't it start? Wisconsin AENL

Change the sparkplug out with another. I have found on my race motors that there are times that even when a new plug may fire well outside the cylinder and will not fire when installed. It does happen...can't say why.

is the plug wet when you remove it? Are you getting a raw gas smell when you crank it over or is the carb dripping? If there is no smell I am inclined to also suggest lightly tapping on the carb to unstick a closed float needle. With these new oxygenated gas formulaes we have to contend with it as it becomes an increasingly common problem.

also check to make sure the throttle butterfly is opened up with the idle screw. butterfly may be closed too much to allow an airflow.

Good luck

Bill
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Old 03-22-2009, 01:01:17 AM
jumpinjivinjoe jumpinjivinjoe is offline
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Default Re: Why won't it start? Wisconsin AENL

The spark plug is not wet. But the carburetor is dripping.
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Old 03-22-2009, 01:11:00 AM
Walt in Jaxn Tn. Walt in Jaxn Tn. is offline
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Default Re: Why won't it start? Wisconsin AENL

Check to see if there is suction at the carb intake. I'd heard a old mechanic refer to using a rag soaked in gasoline to start a engine when he wasn't sure if he was getting vapor into the cylinder.

--Walt--
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