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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Wisconsin AEN timing issue


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  #1  
Old 08-18-2009, 05:21:51 PM
MikeinBaja MikeinBaja is offline
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Default Wisconsin AEN timing issue

I have lined up the x on the flywheel to the shroud mark and got the x on the magneto in the middle of the inspection hole. This gives me TDC, correct? The mag snaps when the flywheel mark has passed 180degrees so I get a massive (ouch) kickback and no ignition!. I recently rebuilt the mag and get a fantastic spark and also rebuilt the Zenith (which mightbe flooding..) I thought the woodruff key might be sheared but it is OK. There is a simple solution but I am brain dead after troubleshooting and finally getting my TJD to fire beautifully.
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Old 08-18-2009, 09:25:15 PM
Pat Barrett Pat Barrett is offline
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Default Re: Wisconsin AEN timing issue

You could have the mag, 180 out If you took the gear off, it can go either way, back on.
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Old 08-18-2009, 10:08:48 PM
Ed Radtke Ed Radtke is offline
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Default Re: Wisconsin AEN timing issue

set the flywheel marks on the compression stroke
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Old 08-18-2009, 10:40:15 PM
ar2stp48 ar2stp48 is offline
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Default Re: Wisconsin AEN timing issue

Pull the plug and put your finger over sparkplug hole; turn engine over slowly to verify you are coming up on compression stroke --not intake or exhaust. A feeler can be made from a length of small stiff wire to determine exact TDC. Now check location of "x" and time to mag gear.
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Old 08-19-2009, 12:21:52 PM
Dempster Dempster is offline
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Default Re: Wisconsin AEN timing issue

Like others said you didn't time it on compression TDC or the gear is on the mag wrong off 180 degrees. To make sure the gear is on mag correctly there should be another mark on back flat side of gear a dot or line mark. When the impulse is turned CW in rotation and the trip dogs are against the pin put the gear with that mark to the top or upper side of the mag. If you need illustration of that or Fairbanks Morse 1 cylinder mag instructions PM or email me I haven't figured out a way to put pics on here yet.
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Old 08-21-2009, 08:40:55 PM
MikeinBaja MikeinBaja is offline
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Default Re: Wisconsin AEN timing issue

Thanx to everybody. I was sure to have TDC on the compression stroke and I have never removed/replaced the gear on the mag. I'm fairly certain I timed it as it is supposed to be before and had the engine running OK but it never ran consistently.
Could the advance/retard mechanism in the mag be screwed up?
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Old 08-22-2009, 12:55:30 AM
Dempster Dempster is offline
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Default Re: Wisconsin AEN timing issue

You may have fuel system or carburetor problems make sure the fuel system is clean and carb up to snuff. Good plugs, good head gasket and valves set correct. The magneto impulse drive will trip when mag turns slow for starting but then when speeds up should kick out not hearing it tripping anymore. If the spring was broke in it you probalby couldn't get it started or would have trouble spinning it fast enough to start. The impulse trip dogs and pins can wear out on it though where those don't stay kicked out and can cause problems.
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Old 08-22-2009, 08:07:33 AM
Zira Zira is offline
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Default Re: Wisconsin AEN timing issue

Mike -

Did you say it is snapping at 180 degrees? Check & make sure you didn't use the marks for timing the cam shaft to the crank shaft rather that the magneto timing marks. I'll email you that section of the manual. Pull the plug (leave the wire connected), and turn it over. It should click when the keyway on the pto is straight up (unless you have a gearbox). If not, you have the timing wrong.
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Old 08-22-2009, 11:45:07 AM
Dempster Dempster is offline
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Default Re: Wisconsin AEN timing issue

The AEN manual can be downloaded at Wisconsin Motors site.

http://www.wisconsinmotors.com/partc...engineswm.html

You may also want some accessory manuals like those for the magneto and carburetor.

http://www.wisconsinmotors.com/partc...-accesser.html
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Old 08-22-2009, 12:28:22 PM
tom chambers tom chambers is offline
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Default Re: Wisconsin AEN timing issue

check the key way or the key stock it will throw it off
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