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JD A runnin on one cylinder

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steve in ohio

11-10-2002 13:01:46




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I have a 1950 A that i recently got running. When i first got it running it would run on the right cylinder but not the left one. I left it sit for about a month and when i started it up it ran on the left cylinder but not the right cylinder. i've almost ruled out ingition scince it has spark. i have the carb apart currently but cannot find any plugged passages. the valves are opening and closing. what kinda puzzles me is that the spark plug wires on the distributor are the exact opposite as what is on my john deere 70. also if i put a pto load on it after about 10 seconds the other cylinder will start to fire again. any ideas i would like to know. thanks

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snowmantn

11-11-2002 08:23:26




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 Re: JD A runnin on one cylinder in reply to steve in ohio, 11-10-2002 13:01:46  

Try some new plugs because they can fire when you test them but may not under pressure. I had this trouble with my '51 A. It has always been a little touchy about plugs. Good luck with your A.

snowmantn



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Will P

11-10-2002 16:36:18




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 Re: JD A runnin on one cylinder in reply to steve in ohio, 11-10-2002 13:01:46  
If I don't work my B it will do the same. These tractors were made to run at rated RPM at all times. The plugs are fouling out alittle. If you have Champions in it. Get rid of them. Put in a set of Autolite 386 or 388. Trust me. You will like them.

Will P



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Chris

11-10-2002 13:17:06




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 Re: JD A runnin on one cylinder in reply to steve in ohio, 11-10-2002 13:01:46  
Steve,

Even though you have a spark it could still be ignition. Have you tried NEW plugs maybe ones not firing under compression. But if its a traveling miss it sounds like youve got a cracked cap. If your wires are opposite on the other tractor one of them is probably 180 degrees out of time the flywheel side plug goes in the top hole. If it were me i would replace the plugs cap points and rotor and the you will know you should have a good spark.

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