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Spark problem


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#1 speedbird OFFLINE  

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Posted October 27, 2016 - 10:31 AM

I have 1978 B&S 16hp with an IC ignition. It has had intermittent spark problems since I got the tractor  about 3 years ago. Last week the spark quit completely. I checked the the plug, and disconnected the kill wire.That left the coil assembly and still no spark. I got a new coil assembly and put it in. This gave a weak spark but enough to run the engine, for about 1/2 hour.   Then it quit, with no spark again. Checked all the same things again plus made sure the space between the coil and the flywheel was .010 . Anyone out there have any idea about what I'm missing? Thanks for any idea's.


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#2 ducky OFFLINE  

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Posted October 27, 2016 - 10:55 AM

Weak magnets???????????


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#3 jms180 OFFLINE  

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Posted October 27, 2016 - 11:19 AM

if any voltage gets to the kill wire it will destroy the coil


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#4 larrybl OFFLINE  

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Posted October 27, 2016 - 11:53 AM

.010 may be a bit much, I use a folded sheet of paper (one fold) and place it between the coil and flywheel magnet. Snug the coil down, remove the paper. Spin flywheel by hand one full turn to make sure it doesn't touch the coil. 


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#5 chieffan ONLINE  

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Posted October 27, 2016 - 12:09 PM

.010 may be a bit much, I use a folded sheet of paper (one fold) and place it between the coil and flywheel magnet. Snug the coil down, remove the paper. Spin flywheel by hand one full turn to make sure it doesn't touch the coil. 

I agree, especially if the magnets are a little on the week side.   If the new coil gave a week spark, it has to be the air gap or magnets. 



#6 DH1 OFFLINE  

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Posted October 27, 2016 - 03:08 PM

When you mounted the coil does it have a good ground?



#7 speedbird OFFLINE  

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Posted October 28, 2016 - 05:48 PM

Thanks for the tips fellows. I checked the coil for a good ground. It was good. I was checking the kill wire for voltage on it and I noticed the the spade lug that attaches it to the coil was loose enough to let it touch the block behind the coil. I tightened it and wrapped it with tape, Used the folded paper to set the clearance  instead of at .010 that the book said. It now has the best spark it has had since I got it. I'll keep my fingers crossed. This tractor has become my favorite one for using around the yard- if it will keep running. Thanks again for the help.


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#8 crittersf1 OFFLINE  

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Posted November 02, 2016 - 03:26 PM

Did that fix it?

 

Thanks for the tips fellows. I checked the coil for a good ground. It was good. I was checking the kill wire for voltage on it and I noticed the the spade lug that attaches it to the coil was loose enough to let it touch the block behind the coil. I tightened it and wrapped it with tape, Used the folded paper to set the clearance  instead of at .010 that the book said. It now has the best spark it has had since I got it. I'll keep my fingers crossed. This tractor has become my favorite one for using around the yard- if it will keep running. Thanks again for the help.






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