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Any of our knowledgeable members have a JD M or MT ?


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#1 propane1 ONLINE  

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Posted January 17, 2018 - 07:44 PM

Or maybe a JD 40. I have a question.

Noel
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#2 James Bosma OFFLINE  

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Posted January 17, 2018 - 07:52 PM

Nope I am sorry I can't help

I only have WD 40


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#3 Gtractor ONLINE  

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Posted January 17, 2018 - 08:08 PM

Lowell  [Grnspot110] has a 40


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#4 Cribs1450 OFFLINE  

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Posted January 17, 2018 - 09:45 PM

Nope I am sorry I can't help

I only have WD 40

I love it Haa!


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#5 Leonard VanCamp ONLINE  

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Posted January 17, 2018 - 10:25 PM

Not sure if I can answer your question but ask away!


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#6 propane1 ONLINE  

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Posted January 18, 2018 - 03:35 AM

Is it normal for one cylinder not to fire while idling. And as you put load on it it begins to fire. A JD A apparently works this way. A friend of mine has a JD MT and has number 2 cylinder not firing. Has spark, has 100 psi compression. Changed plug. Put gasoline in the cylinder put the plug back in. Still no fire.

Noel
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#7 James Bosma OFFLINE  

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Posted January 18, 2018 - 03:10 PM

Have you tried swapping the spark plugs from onside to the other for curiosity

 

Does the JD M use the wasted spark system?, if so, you can switch plug wires and see if other cylinder is now dead

If not than one coil could be gone in the magneto, strong enough to spark without compression but not enough under compression

Picture of mag will help

My dad has rebuilt them before so with mag type and model I can ask him and reply with his suggestions


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#8 jimmy G ONLINE  

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Posted January 18, 2018 - 07:34 PM

Try another plug wire frist, check for excessive shaft play in the distributor, if the intake valve sticks for just a millisecond the push rod will disconnect(you will still have compression),an intake leak will miss at idle and pick up under load, if one wire is longer than the other and the long one is missing could be a weak coil, if so switch wires and see if miss moves
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#9 propane1 ONLINE  

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Posted January 18, 2018 - 08:21 PM

James Bosma. It is a points set up not a magneto. It sure is strange problem. Talked with a mechanic guy today who has an JD M. He really had no answers. An M and a MT have the same engine.

Noel
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