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  #1  
Old 05-25-2013, 09:49 PM
gmiller442 gmiller442 is offline
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Default K91 spark question
Why would a K91 have al the spark you could ever want when hooked up to a spark tester, but then have no spark through a brand new plug? this one has got me baffled.

Any help is appreciated!!

Thanks,
gmiller442
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  #2  
Old 05-25-2013, 11:23 PM
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darkminion_17 darkminion_17 is offline
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Try another plug.
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Old 05-25-2013, 11:29 PM
gmiller442 gmiller442 is offline
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I did use another plug. Same thing. When I attach the tester to the plug wire and then ground it to the engine, the tester lights up like crazy. When I replace the tester with a know good plug and ground the plug to the cylinder head, I get nothing. ??????
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Old 05-26-2013, 06:51 AM
R Bedell R Bedell is offline
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Since this K91 is not on a Cub Cadet product, there is little known about it. The Kohler Engines of that era could have two Ignition Systems - (A) Magneto, or (B) Battery. Which one do you have...???
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Old 05-26-2013, 07:10 AM
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the metal or threaded part of the plug has to be touching a ground like a head bolt or cooling fin
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Old 05-26-2013, 04:03 PM
gmiller442 gmiller442 is offline
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It's a magneto system. I did try to ground the plug on the cylinder head and got nothing. I took the plug out of the engine in question and put it in a know good engine and got great spark. I really don't think its the plug. I think it may have a weak spark. It's strong enough to light the tester but not enough to fire the plug.
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Old 05-26-2013, 04:13 PM
R Bedell R Bedell is offline
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Did you check the Plug Wire itself....????
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Old 05-26-2013, 05:54 PM
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a weak spark is possible, it don't take much to light a light. the spark tester I have has a 1/4 in gap to jump. it cracks when it sparks
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