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JD70 RUNS ROUGH

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JOE

06-28-2000 19:12:36




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A FRIEND OF MINE HAS A 70 ALL FUEL THAT HE HAS JUST BOUGHT.WHEN HE GOT IT HOME IT WOULDN'T RUN SMOOTH AND BACKFIRED THROUGH THE EXHAUST. WE TRIED
DIFFERENT CARBS AND DISTRIBUTORS,WE ALSO CHECKED THE TIMING MARKS AND PART # ON CAM,CRANK AND ALSO CHECKED THE PISTONS AND HAD THE HEAD WORKED.ALL TIMING AND PART # THROUGHOUT THE ENGINE SEEMS TO BE CORRECT.HOWEVER WHEN TIMING IS SET BY THE BOOK THE LOBS WHERE THE DISTRIBUTOR GO ARE NOT HORIZONAL LIKE THEY SHOULD BE.WE JUMPED THE CAM GEAR 1 TOOTH TO CHANGE THE TIMING ALTHOUGH MARKS ARE OFF THE TRACTOR SEEMS TO RUN BETTER BUT STILL MISSES.THE TRACTOR WILL RUN SMOOTH ON 1 CYLINDER.THE TRACTOR WILL RUN GOOD ON BOTH CYLINDERS UNDER LOAD.ANY COMMENTS WOULD BE HELPFUL

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Mr. Thomas

07-03-2000 15:35:53




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 Re: JD70 RUNS ROUGH in reply to JOE, 06-28-2000 19:12:36  
check the mag on that John Deer. Sometimes the mag isnt firing right.



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Don

07-03-2000 18:26:32




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 Re: Re: JD70 RUNS ROUGH in reply to Mr. Thomas, 07-03-2000 15:35:53  
70 dont have a mag however the condenser's we get now are abt. 50% junk so you might change it. Don



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BigJ

06-29-2000 12:44:30




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 Re: JD70 RUNS ROUGH in reply to JOE, 06-28-2000 19:12:36  
I had a G that fouled number 2 plug and the problem was in the rocker arm setting.I set the rocker arms by the book specs and never fouled another plug.



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Darryl

06-29-2000 05:10:19




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 Re: JD70 RUNS ROUGH in reply to JOE, 06-28-2000 19:12:36  
My B was running rough a week ago. Put in 2 sets of C88L's. Would run okay for about 10 minutes then run rough again. Put in a set of plugs I got from my Deere dealer. Same thing. Finally looked at my book and discovered the carburator was adjusted way too rich. Back off the settings to that recommended by the book and now it starts and runs fine. Tractor was hard to start too.



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GEM

06-28-2000 20:59:41




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 Re: JD70 RUNS ROUGH in reply to JOE, 06-28-2000 19:12:36  
As odd as it may seem try a set of a/c c88L plugs. I have a 50 and 60 and both run good. Had same problem awhile ago,local j.d. dealer told me they will not run on anything but a/c' and he was 100% right.also make sure you have copper core plug wires. good luck, Gerald



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duke

06-28-2000 19:49:56




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 Re: JD70 RUNS ROUGH in reply to JOE, 06-28-2000 19:12:36  
I had worn spots on my rocker arm that were intermittantly latching the valves open.

You should check to see that the flywheel is on the right spline'
To change the position of the distributor drive you should change the position of the govenor drive gear not the cam gear.

Good luck



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