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1250 with Wisconsin S12d still running rough.


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#1 bread320i OFFLINE  

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Posted June 27, 2011 - 08:18 PM

I have been having trouble with my S12d misfiring. With the original points installed I could file and clean them and have it running decent for an hour, then it starts misfiring again. So I changed the points for a new set, and now it always misfires. I have the timing set off the timing mark from the flywheel (not set using point gap). Im pretty sure its ignition related because running even the slightest choke makes it run even worse.
So what do I look at next? Bad wiring, coil, condensor, something else?

#2 olcowhand OFFLINE  

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Posted June 27, 2011 - 08:26 PM

A bad condenser will raise the voltage to the points, causing them to burn & require dressing the contacts. I would try a new condenser. Now why a new set of points made it worse I'm not sure, unless the new points need dressed as well. I've had many sets of brand new points that would not make good contact until I dressed them down.
  • mikebramel said thank you

#3 michelle OFFLINE  

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Posted June 27, 2011 - 09:39 PM

It's not running right because you haven't given your wife enough attention lately.









(kidding.)

#4 Bruce Dorsi ONLINE  

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Posted June 27, 2011 - 10:44 PM

If you didn't replace the condenser, I would start there, as olcowhand suggested.

It could also be as simple as a bad spark plug.

Do you have any oil mist or coating inside the breaker box? ......I've seen Wisconsin engines where the oil followed the points plunger and would coat the points. .....Once the oil dripped off the points, the engine would re-start and run properly until enough oil entered the breaker box to repeat the cycle.

Also, the insulator at the bottom of the breaker box may be worn or broken.

How about a failing ignition switch?

#5 bread320i OFFLINE  

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Posted June 28, 2011 - 07:59 PM

I will try to get a condensor this weekend and report back then.

#6 bread320i OFFLINE  

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Posted July 07, 2011 - 10:01 PM

A bad condenser will raise the voltage to the points, causing them to burn & require dressing the contacts. I would try a new condenser. Now why a new set of points made it worse I'm not sure, unless the new points need dressed as well. I've had many sets of brand new points that would not make good contact until I dressed them down.


I put in a new condensor this week. Ive run the tractor for a few days now and its been running great. Actually better then it ever has, I timed the motor using Wisconsins Engines recommended way.
Thanks for the help.

#7 Bolens 1000 OFFLINE  

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Posted July 08, 2011 - 06:15 AM

Glad to hear it's back up and running :dancingbanana:

#8 olcowhand OFFLINE  

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Posted July 08, 2011 - 08:16 AM

Good deal! :thumbs:

#9 DGS345 OFFLINE  

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Posted July 09, 2011 - 06:41 AM

Where did you find a condenser and points? I cannot seem to find any here?

#10 michelle OFFLINE  

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Posted July 10, 2011 - 08:36 PM

I picked up the parts, so I guess I can answer! (:

Points came from a small engine place outside of Milwaukee and the condenser was ordered through NAPA.

#11 bread320i OFFLINE  

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Posted July 10, 2011 - 08:39 PM

The points came from a Wisconsin Engine dealer. The condensor was from Napa, though not listed for a S12d. It is the same from a TRA-10D or a TR10D

#12 mikebramel OFFLINE  

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Posted July 10, 2011 - 09:25 PM

Engine Service
Carmen Ave
Milwaukee, WI




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