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JD 50 points going bad in a short time

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Dave G

07-05-2001 10:48:47




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Has anyone had problems with JD 50 going through points? I have a bad barely running tractor that I am looking to blame on the points (after going through the carb).

Thanks for any comments




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zane

07-06-2001 18:08:16




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 Re: JD 50 points going bad in a short time in reply to Dave G, 07-05-2001 10:48:47  
Clooney's probably right, as usual. But Doc's got a point (watch out for the pun). If the condenser (capacitor) is bad, the points will arc unnecessarily when opening and closing, even under the right voltage, and burn up in short order.



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Dave 2N

07-05-2001 18:50:49




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 Re: JD 50 points going bad in a short time in reply to Dave G, 07-05-2001 10:48:47  
As usual, Clooney's got the answer; our 70 gave us HE@@ until we put in a ballast resistor.



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Clooney

07-05-2001 16:44:10




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 Re: JD 50 points going bad in a short time in reply to Dave G, 07-05-2001 10:48:47  
Dave, if it is indeed a points burning problem & not still a problem in the carb or some other area there are a few things to check. If I remember correctly the J.D. 50 after s/n 5021480 used a ballast resistor & 6 volt ignition coil with by-pass starting current (12 volts) to the coil during cranking & 6 volts during running. It's possible at one time someone has removed the ballast resistor & run 12 volts directly to the 6 volt coil. Or installed a late 6 volt coil on an early tractor in place of the 12 volt coil, in either case point burning & poor running will result.

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Dave G

07-05-2001 20:33:31




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 Re: Re: JD 50 points going bad in a short time in reply to Clooney, 07-05-2001 16:44:10  
Thanks, I wasn't aware of the 6V or 12V coils. I'll check the coil and see what voltage I got going to it.



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Clooney

07-06-2001 04:43:33




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 Re: Re: Re: JD 50 points going bad in a short time in reply to Dave G, 07-05-2001 20:33:31  
Dave, you probably should be more concerned with the voltage going to the points with the engine running. If you measure the voltage going to the coil do it with the engine running as open circuit (points open) voltage will be 12 volts on either early or late systems due to no load on the resistor with the points open.



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Doc

07-05-2001 16:12:19




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 Re: JD 50 points going bad in a short time in reply to Dave G, 07-05-2001 10:48:47  
If it's "burning" or going through points quickly, wouldn't replacing the condensor fix that? Thought the condensor was there to decrease the voltage on the points... It'd be a quick test...

Tell me if I way off base here...

Doc



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Dave G

07-06-2001 18:19:11




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 Re: Re: JD 50 points going bad in a short time in reply to Doc, 07-05-2001 16:12:19  
I think your right, condensers can do this. If I get new points I'll get a new condenser too. As I understand they act as an electrical shock absorber so the points don't arc very much.



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Bob K

07-05-2001 12:34:22




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 Re: JD 50 points going bad in a short time in reply to Dave G, 07-05-2001 10:48:47  
On my 50 about four years ago, I had a terrible time getting it to stay running. Had to pull it to start it and would only run at very low RPM. (If you've ever seen a "slow" race at a tractor gathering, you'll understand very low RPM.) After going through the carb, I decided to have the distributor rebuilt. Never had any more trouble (other than replacing plugs every so often) and I've never messed with the points. If your plugs are okay (new plugs are a cheap first test), it could be a shot coil giving you weak spark which will only fire the plug at low manifold pressure (throttle settings).

In my aircraft mechanic's classes many moons ago, I learned that increased pressure inside the cylinders at higher RPM increases the resistance of the air gap at the spark plug. It may be strong enough to run at low RPM but not at higher operating speeds.

The $90 I spent on the distributor rebuild was well worth having a smooth-running tractor. Stick with it.

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Chuck

07-05-2001 14:37:33




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 Re: Re: JD 50 points going bad in a short time in reply to Bob K, 07-05-2001 12:34:22  
you'd be money and performance ahead to go to electronic ignition...have done so on a 50 and 2 520, would never mess with points again. Higher voltage and smoother performance....got my from Genesee electronics however you can get them from other sources...best thing I ever did for my tractors....you can install it simply and you can't believe the performance.



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Dave G

07-05-2001 20:31:46




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 Re: Re: Re: JD 50 points going bad in a short time in reply to Chuck, 07-05-2001 14:37:33  
I hear ya. I got one for my Farmall B and I think I'm going get one for the 50 too. Theres not much good about points.



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