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MF12 with trouble some 12hp Tecumseh


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#16 bread320i OFFLINE  

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Posted July 23, 2011 - 06:09 AM

I checked the height of the pins, and they were right. The Ignitions units are the same and are also mounted identical. I gaped the unit to .008 It starts up great and idles fine, but once you bring up the rpm's it seems to run rough.

#17 MH81 ONLINE  

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Posted July 23, 2011 - 06:59 AM

Sounds like the front pin isn't doing it's job? Anyone else?

From what I understand, the front pin is shorter so it won't trigger until the engine is running. This advances the engine 17 degrees.

I will try to look into this in my manual tonight. Gotta work today.

#18 bread320i OFFLINE  

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Posted July 23, 2011 - 07:32 AM

Sounds like the front pin isn't doing it's job? Anyone else?

From what I understand, the front pin is shorter so it won't trigger until the engine is running. This advances the engine 17 degrees.

I will try to look into this in my manual tonight. Gotta work today.


You are right. the Tall pin is for start up, and after a certain rpm the shorter pin takes over and advances the timing. This was my thought but was thinking it could still be the Ignition unit.

#19 bread320i OFFLINE  

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Posted July 24, 2011 - 12:21 PM

I contacted Ed Stoller, and he suggested using a timing light to see if the SSI is switching pins after start up. Im going to try this tonight or tomorrow

#20 MH81 ONLINE  

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Posted July 24, 2011 - 07:56 PM

Looked at the manual today. The only pin adjustment was to remove the flywheel & drive the pins in or out.

The shorter pin is to be .187" and the longer pin .250

The gap from the long pin to the pickup was listed as 5-10 thou( you're already at 8)

#21 bread320i OFFLINE  

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Posted July 24, 2011 - 09:35 PM

I just ran the engine with a test light and the SSI is running off the correct pin, but it does have a consistent misfire. I will check the spark plug before I buy anything more for this engine.

BTW, I contacted overnight solutions and the replacemant coil is currently available

Edited by bread320i, July 24, 2011 - 09:41 PM.

  • mikebramel said thank you

#22 bread320i OFFLINE  

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Posted August 02, 2011 - 09:57 PM

The Massey 12 was running pretty good last night. I spent some time cleaning the carb, and adjusting it. It was still running rough, but I kept running it around the yard and it seemed to clear up. So I'll try again and see how its running them

#23 DH1 OFFLINE  

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Posted August 02, 2011 - 10:06 PM

Your engine might benefit from lapping the valves and cleaning the carbon out of the combustion chamber.

Sounds like your getting working better.

Edited by DH1, August 02, 2011 - 10:24 PM.
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#24 MH81 ONLINE  

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Posted August 02, 2011 - 10:20 PM

Glad to hear it's getting better. Are you getting much blow by? I'm wondering if you had sluggish or sticky rings.

#25 bread320i OFFLINE  

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Posted August 03, 2011 - 09:09 PM

Your engine might benefit from lapping the valves and cleaning the carbon out of the combustion chamber.

Sounds like your getting working better.


Glad to hear it's getting better. Are you getting much blow by? I'm wondering if you had sluggish or sticky rings.


I did remove the head the clean all the carbon. I didnt lap any valves. The engine ran really good when I got it so I didnt think it needed much.




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