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Discussion Starter · #1 ·
Hey everyone Im replacing my coil on my 1975 mf12. It has a tecumseh hh120 with ssi. Didnt know if you guys know the gap between the the little nub on the flywheel and the coil. Because it currently doesnt have spark and i think its because i dont have the gap right.

Thanks,

Collin
 

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.010 is the Mag air gap
 
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Discussion Starter · #5 ·
If you still don't have spark after that check the lead wire that goes from the stator that plugs into the side of the solid state they always break inside the jacket.
yeah i just checked i stil dont have spark and from the looks of it that lead wire isnt broke
 

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I suggest you also check the height of the two trigger studs. Not sure I remember correctly, but one is at 3/16 and the other is 1/4. I think the 1/4 is the more "retarded" one for starting, then the 3/16 one will start to trigger once the flywheel start spinning fast. I had a Tec with very high exhaust temps and low power output because those depths had been changed.

Found the thread I worked out of with the suggestions and my findings:

http://gardentractortalk.com/forums/topic/13926-tecumseh-engine-lacks-power/
 

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Discussion Starter · #7 ·
I suggest you also check the height of the two trigger studs. Not sure I remember correctly, but one is at 3/16 and the other is 1/4. I think the 1/4 is the more "retarded" one for starting, then the 3/16 one will start to trigger once the flywheel start spinning fast. I had a Tec with very high exhaust temps and low power output because those depths had been changed.

Found the thread I worked out of with the suggestions and my findings:

http://gardentractortalk.com/forums/topic/13926-tecumseh-engine-lacks-power/

ok thanks
 

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yeah i just checked i stil dont have spark and from the looks of it that lead wire isnt broke
you have to remove the stator to check it good and meter it to see if it is broken in the jacket when you move it around. 140 ohms for a 20 amp stator. 470 ohms for a 10 amp stator
 
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Most of the guys have covered it. The gap before module trigger and the tall stud is .006-.010.

The tall stud is at Top Dead center, it is used for starting. As soon as the RPM's get going ( over 200) it jumps to being triggered off the short stud which is approx. 25* advanced.
 
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