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John Deere AR help

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Ben Wolfgang

12-03-2002 14:54:48




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i have a 1951? JD "AR" it seems at idle it trys to hunt for fuel,but the governer keeps it running.under a load its fine. there is no water in the tank and the carb is clean.any help would be great. Thanks!




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Clooney

12-03-2002 16:07:38




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 Re: John Deere AR help in reply to Ben Wolfgang, 12-03-2002 14:54:48  
Ben, grab the throttle linkage & hold it firm to see if it will idle steady at a slow speed. If so make sure the idle stop spring is still there & the stop screw is adjusted out far enough to hit it & depress the spring. If that is ok adjust the throttle linkage 1/2 hole short of entering the throttle lever hole at wide open throttle on both the carb & hand lever. If it still hunts after those adjustments turn the idle screw in until seated then back it out 2 turns & try that, if it still hunts, back it out a 1/4 turn at a time to see if it gets better. If it still hunts, try closing the choke to see if it gets better, if so, you have a carb idle circuit problem, or plugged idle transfer hole in the carb bore, or worn throttle shaft bushings, or a vacuum leak. If you have to go into the carb let me know & I will send you a diagram showing the holes that need cleaning, some aren't even accessible by pulling those brass plugs.

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John T

12-03-2002 15:49:09




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 Re: John Deere AR help in reply to Ben Wolfgang, 12-03-2002 14:54:48  
Ben, do you mean when the throttle is set at idle the governor keeps opening up, then she speeds up a little bit, then slows down and the governor takes her back up???? If so, first try opening the idle needle some and see if she idles better then. Is the stop adjustment on the carb set too low that it just wont idle down that much?? If the idle needle adjustment is opened some and the stop isnt too low and the governor still hunts, it could well be a clogged idle circuit in the carb. When that happens, they will run fine under load and at fast throttle, but when the carb calls for the idle circuit, if its plugged, the governor takes her back up over and over and over. The only way Ive been able to cure that problem is disassemble the carb and remove all the brass drill plugs (a little heat usually required) and drill out the passages using those No 40 or No 53 extra long drill bits I bought from Robert Beaver. Try opening the idle needle and setting up the stop first and then post back if the problem persists. Is the timing set about right??? Ol John T Nordhoff in Indiana

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