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JD M Misfiring

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pete

12-07-2002 09:28:01




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We were using a John Deere M the other day bringing in some fire wood and it began to misfire and loose power, at times it seemed like it was actually double firing not misfiring. The motor would pop as normal but at a much faster interval. Where do I start, carb or electrical?
Has not had a tune up or carb rebuild for the last 8 years but has only seen moderate work.
Any ideas on where to start would be appreciated.
Thanks guys. Happy Holidays!!

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JDM Guy

12-08-2002 05:19:57




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 Re: JD M Misfiring in reply to pete, 12-07-2002 09:28:01  
pete, do you have a weather cap on the top of your exhaust pipe? When my M did the same thing the little weather cap would go up and down really fast. When you said it sounded like it fired at a faster interval you were most likly hearing the engine running on only one cylinder. My guess would be plugs then a tune up. I had the same problem with my 1951 M last summer.



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Bus Driver

12-07-2002 10:32:10




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 Re: JD M Misfiring in reply to pete, 12-07-2002 09:28:01  
The suggestions of John T are the best place to start. If those do not solve the problem, remove the valve cover and look for a bent pushrod or a stuck/sticking valve.



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John T

12-07-2002 10:16:46




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 Re: JD M Misfiring in reply to pete, 12-07-2002 09:28:01  
Hi Pete, Yours is a pretty wide open question, but with not much to go on, the first thing I do is look at the plugs and replace them if they are anything but a nice clean gray color or appear dirty or fouled or have alot of residue built up. Next, I would look at the points to see if they are carboned up or pitted or oxidized bad and if they are gapped properly. Go ahead and clean their surfaces up best you can when youre in there but not too abrasive. If the plugs and points are either cleaned up or replaced, you might also try to adjust ther carb then post back with the condition and appearance of the plugs, wires, and points before we go further. My first guess is from settign and light use the points and plugs may need attention and the carb may be clogged with varnish etc. or you have some water present. Also, see if the sediment bowl is clean and free and if theres a good flow of clean water free gas to the carb at least. Check for water in the sediment bowl (drain it and the carb till you get clean gas and no water or crud) and let us know if youre seeing any black or blue smoke out the exhaust. Have you cleaned and serviced teh air cleaner lately?? Good Luck, Ol John Nordhoff

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Wayne in Tn.

12-07-2002 11:39:16




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 Re: Re: JD M Misfiring in reply to John T, 12-07-2002 10:16:46  
On any Dubuque tractor, the first place to start is a new set of plugs, 95% of the time this will do it. Especially if it was running ok before.



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