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MF12 with trouble some 12hp Tecumseh


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#1 bread320i OFFLINE  

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Posted July 09, 2011 - 10:32 AM

My recent MF12 purchase was bought with a known problem. Previous owner told me that when the engine gets hot it shuts off. He had this probem years ago and replaced something. Had something to do with the ignition, well today it already died on me and I would like to figure it out. Any ideas guys? I did check for spark, and it was pretty weak. I had to close the plug gap to get a weak spark.

#2 MH81 OFFLINE  

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Posted July 09, 2011 - 10:52 AM

Sounds like the CDI or pickup behind the flywheel is breaking down when hot. Do you happen to have another CDI to put in it?

#3 coldone OFFLINE  

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Posted July 09, 2011 - 10:59 AM

If it has the SSI module under the flywheel, or best bet is to go to Ed Stoller site and see if he can help you.
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#4 bread320i OFFLINE  

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Posted July 09, 2011 - 07:29 PM

If it has the SSI module under the flywheel, or best bet is to go to Ed Stoller site and see if he can help you.
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I honestly dont know if this engine has solid state ignition or not. Is there a easy way to find out without removing the flywheel?

#5 DH1 OFFLINE  

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Posted July 09, 2011 - 07:39 PM

I honestly dont know if this engine has solid state ignition or not. Is there a easy way to find out without removing the flywheel?


Look for the points cover, if it has points no SSI unit.
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#6 mikebramel OFFLINE  

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Posted July 09, 2011 - 10:38 PM

Definately a solid state unit. So the spark drops off when it gets hot?

#7 FirefyterEmt OFFLINE  

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Posted July 10, 2011 - 05:07 PM

They can do that, mine did the exact same thing. At this point, the Chrysler Ignition Conversion (Ed Stoller Conversion) is the way to go. I have done two of them, and it's not all that hard with basic wiring knowledge. It will cost close to the cost of a used coil if done "all out", but the used coul may fail in a week!

Here is the one I am working on: http://gardentractor...ion-hydro-6006/

If you have any questions, I would be glad to help!

Edited by MH81, July 11, 2011 - 04:10 PM.


#8 bread320i OFFLINE  

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Posted July 11, 2011 - 06:57 PM

Will the setup from Overnight-Solutions work on this engine?

#9 mikebramel OFFLINE  

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Posted July 11, 2011 - 07:19 PM

Not for the one you have

#10 MFGray OFFLINE  

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Posted July 11, 2011 - 08:57 PM

Will the setup from Overnight-Solutions work on this engine?

That depends on how long you want to wait. Overnight Solutions have just come up with a replacement for the SSI unit with all the components separately mounted on a small board that fits exactly where the old aluminium cased SSI unit sits above the flywheel. (That makes it easy to replace whichever part might fail in the future). Problem is they are not available quite yet, but there is a waiting list that you can join..... As long as it is this that is your problem, not the stator, then Overnight Solutions seem to have an elegant solution.

George.
  • FirefyterEmt said thank you

#11 tweidman OFFLINE  

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Posted July 11, 2011 - 09:37 PM

That depends on how long you want to wait. Overnight Solutions have just come up with a replacement for the SSI unit with all the components separately mounted on a small board that fits exactly where the old aluminium cased SSI unit sits above the flywheel. (That makes it easy to replace whichever part might fail in the future). Problem is they are not available quite yet, but there is a waiting list that you can join..... As long as it is this that is your problem, not the stator, then Overnight Solutions seem to have an elegant solution.

George.


That is cool, but seems like it might be pricey?

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#12 bread320i OFFLINE  

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Posted July 22, 2011 - 05:47 PM

I swaped the ignition unit from a Sears tractor I have, and I got the tractor to run again. But now it runs like the timing is off? I did gap the Ignition unit and flywheel and Ive played with the carb and nothing changes. So what should I be looking for now?

#13 MH81 OFFLINE  

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Posted July 22, 2011 - 09:33 PM

Adam, did either/ both units have pins in the flywheel on the outside?

#14 bread320i OFFLINE  

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Posted July 22, 2011 - 09:37 PM

Both units have pins in the flywheel. The Sears Suburban 12 has a delco starter generator, and the Massey has a alternator. The coil behind the flywheel is different, but the ignition unit is the same.

#15 MH81 OFFLINE  

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Posted July 22, 2011 - 09:58 PM

is the CDI above the flywheel the same configuration? If not, it will change timing as the pickup is in a different place. Also, check the height of the two pins re: the techumseh manuals. If you can't find the info there, let me know & I will look it up. I think I have it in a service manual.




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