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51 M hitting on one

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Drail

11-16-2001 18:07:05




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My Little "M" is hitting on only one cylinder. It had been doing fine.I had replaced the distributer cap,rotor,points & condenser.New spark plug wires and plugs. Ran like a champ! Now it only wants to hit on the back cylinder. I've found if I pull the spark plug wire out of the distributer enough to make it arc the front cylinder will hit.So I changed the wire. Same results. Why does it "HIT" when I make it arc but not when the wire is seated in the cap? Also what is a good plug for the old tractor? THANKS

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Dan

11-18-2001 19:22:46




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 Re: 51 M hitting on one in reply to Drail, 11-16-2001 18:07:05  
One more thing. have a 430 that fouled the front plug all the time, I rebuilt the carb. It seems these eaarly 2 cylinder uprights tend to draw more fuel into the front of the manifold so front plug fouels.



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Drail

11-17-2001 17:17:39




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 Re: 51 M hitting on one in reply to Drail, 11-16-2001 18:07:05  
Thanks guys! I'll give it a try.



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CPeter

11-17-2001 12:08:46




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 Re: 51 M hitting on one in reply to Drail, 11-16-2001 18:07:05  
I use antifoulers on both my 40 and 420.They really work great. These are small extensions that go in the spark plug hole and then the spark plug goes into the extension. It creates a little chamber that is not subject to getting the oil from the cylinder. Not only does it prevent fouling, but the tractors start and run better.

Honda used a similar design on some of their engines in the past. The antifoulers are available at some full line auto parts stores for less that $3.00 each. You may have noticed the recommendation for an "A" earlier. I have had real good luck with these. My 420 would foul a set of plugs in just a few hours, now they last a good long time. (I just checked this morning and these are still available, 11/17/01)

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Clooney

11-16-2001 21:01:59




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 Re: 51 M hitting on one in reply to Drail, 11-16-2001 18:07:05  
Drail, you have a fouled spark plug (again). Put in a new spark plug (Champion H-12) & put the old rotor back in (the new rotors usually have a longer center contact & that lowers the voltage jumping the plug gap, the old rotor will act like when you hold the wire away from the cap). I usually install 2 plug gaskets under the plug to up the heat range slightly also. If you still have fouling problems after all the above put the old condenser back in (if it is original old J.D.) as I have a theory that the new replacement condenser is contributing to plug fouling on the M-40-420. (I have never fouled a plug on an M or 40 with an original condenser, I don't know if that is just coincidence or luck, or actually the condenser difference). If you still foul plugs after all the above trim .020-.030" from the side contact on the dist rotor as that will almost always cure a mis-firing problem on the M by raising the KV firing the plug.

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Joe

11-16-2001 19:43:00




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 Re: 51 M hitting on one in reply to Drail, 11-16-2001 18:07:05  
Sounds like you may have purchased a bad distributor cap. Or there may be a peice of debris inside of the distributor cap terminal.If you still have your old original cap try it, if it is in good working order, or try another new cap.Or test your new distributor cap with a multimeter check for resistance set on ohms. A John Deere dealer should be able to give you the caps resistance specifications. Hopefully this information can be of some of assistance to you.

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