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JD B RUNS ROUGH AFTER REBUILD

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Tim

05-06-2002 10:25:03




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I REDONE A 1946 B, .045 OVER, REBUILT HEAD, NEW WIRES, PLUGS, POINTS, ROTOR, CAP. THE TRACTOR TURNS OVER MANY TIMES BEFOR IT STARTS, AFTER IT STARTS IT SHAKES REAL BAD AND RUNS ROUGH, IF I PULL A WIRE, YOU DONT NOTICE THAT BIG OF A CHANGE IN THE WAY IT RUNS, I DONT THINK ITS CARB. PROBLEMS, BECAUSE IT RUNS FAIR AT A REAL LOW IDEL, I WOULD APPRECIATE ANY HELP. IS IT POSSIBLE THAT MY MAG IS NOT HOT ENOUGH?

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Clooney

05-06-2002 15:53:58




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 Re: JD B RUNS ROUGH AFTER REBUILD in reply to Tim, 05-06-2002 10:25:03  
Tim, is the rough running causing the shake or is the shake a separate issue?
~As John said, check the cam & ignition timing if your issue is poor running & check the flywheel & clutch driver for proper installation & line up if your issue is vibration.
~You could very well have a carb problem as the DLTX carb is really easy to have idle good & still malfunction at higher throttle settings. ~Does closing the choke help the running problem?
~Do both idle & load needles effect the engine operation or can either be removed & still have the engine run? {if so suspect the carb}
~If the ignition checks out ok, you might start by removing the main nozzle & clean the little holes in the side of it.
~Also open the carb drain valve & make sure you have a pencil sized stream of fuel for 30 seconds or more {if not find out why}.
~Make sure the fuel valve is set to allow full fuel flow (sometimes the valve gets turned to only allow a small amount of fuel to reach the carb)
~Because you have replaced so many parts & had so much apart, we are going to need you to do some trouble shooting & post back if problems are found. You have done so many things that diagnosing your problem over the internet is going to be difficult....

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John T

05-06-2002 11:22:57




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 Re: JD B RUNS ROUGH AFTER REBUILD in reply to Tim, 05-06-2002 10:25:03  
Tim, not to worry if shes had all that done its probably minor so I will toss out a few things that come to mind. You say it shakes,,,,, , was the flywheel and/or clutch drive disk removed and possibly not got back in time ???? because that can cause a serious vibration. If the governor was off, its also possible you have the timing off because as you know, the governor shaft (off the cam) is what times and runs the mag. At idle, removign the left plug wire has alot more effect than removign the right even under ideal conditions, so thats not too much a worry. Have you checked the valve lash??? that can be a problem after an overhaul if not set properly. Youre gonna need to first insure shes all in time i.e the crank to cam and cam to governor/mag and then we can worry about the mag and ignition but you have to fix the vibration (clutch or flywheel off time??) and then check the timing and tehn we can proceed. I assume the plugs and wires, points and condensor are new or fine???? because after I went to the expense of an overhaul, I would spend a few more bucks to insure thats all in great shape. Let us know Ol John T

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