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2n won't start

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kent

12-08-2000 18:41:01




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My tractor has ran like a top since I rebuilt the top end 2yrs ago. The other morning it would not start, so I cleaned the carb, checked for spark. The spark looked good but wasn't sure about it under compression, as the tractor still wouldn't start. I changed plugs and the tractor started right off. I ploughed snow(2hrs) then shut the tractor off. A few days later I tried to start the tractor and it will not start again. When I choke the tractor it will sputter while turning over and the gas pours out of the over-flow when you release the start button. I am not sure if it is carb,gas,or a spark problem. I have had trouble with the carb getting a gel-like,varnishy build-up in the bottom when the tractor sat for long periods in the summer. Any suggestions? thanks Kent

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Claus

12-09-2000 08:13:08




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 Re: 2n won't start in reply to kent, 12-08-2000 18:41:01  
I am with Dell, on this. New plugs will sometimes mask a spark problem since they are new with sharply defined electrodes and are not contaminated. If they are contaminated, clean them and try agian. Check your points, for they can cause weak spark also. Your coil needs the proper dwell time to function properly. If fouled plugs are causing your problem, then you may be headed for an overhaul unless the buildup is due to an overly rich mixture. You need to learn to read your plugs as they can be a wealth of information.
Happy Motoring
Claus

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Dell (WA)

12-08-2000 21:46:07




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 Re: 2n won't start in reply to kent, 12-08-2000 18:41:01  
Kent..... ..its amaizing what new sparkplugs will do. There is something about everything being "right".

My best guess based upon your report is: (a) new sparkplugs worked for 2 hrs (b) believe it or not, in 2 hrs you could have "worn" the edge off of the electrodes enuff that your coil voltage will not "jump" the sparkplug gap. (c) sparkplug gaps right out of the box are seldom the "correct gap" anyways. (d) you might check the plug gaps. they should be 0.025 (e) if they are all 0.025 and your tractor STILL won't start, try 0.020. If the tractor kinda starts, you have the dreaded "low sparkies" and will probably need to replace your ignition coil.

But before you replace your ignition coil, be sure that you have performed the 6 volt mantra: "clean, bright, and tight" on all your connections.

One of the original founding members of the N-Board used to claim that 80% of all carb problems were solved in the ignition system. Something to think about.

Howosomever....it is not beyound the realm of possibilities that you really have some water in the gas. Every winter, for precautions, I put a small can of "dry gas" in my tractor..... ...Dell

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kent

12-09-2000 14:22:09




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 Re: Re: 2n won't start in reply to Dell (WA), 12-08-2000 21:46:07  
Just got home from work and read your messages.I will check gaps and points in the morning, the coil was replaced with a brand knew one when the valve train was rebuilt. This tractor is a 1946 and I put a 12v conversion on it this summer because it was always a hard starter in the winter. I don't know if this would have any adverse effect on the coil or condenser. The system has the proper reducer between the battery and coil. I have been told that the voltage from the battery only drops to around 8v not 6v and I wondered if this could be the problem.

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Dell (WA)

12-09-2000 18:16:05




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 Re: Re: Re: 2n won't start in reply to kent, 12-09-2000 14:22:09  
Kent..... ..repeat after me....I will include all the pertinate information when I have a problem and am asking for help....

You neglected to include a vital major piece of information...."I've converted my 2N to 12 volts". This clarifies your problem and also tells me why you have this problem.

Now we have to play "guessing games".

"The system has the proper reducer between the battery and coil. I have been told that the voltage from the battery only drops to around 8v not 6v and I wondered if this could be the problem" YEP!!!!! thats the problem.

The proper reducer would reduce your voltage to 6 volts NOT 8 volts!!! ergo....YOU DO NOT HAVE THE PROPER REDUCER!!!!!

8 volts applied to a 6 volt coil is going to melt the insulative tar and short out some of the internal windings and reduce the sparkies and vola..... NO STARTS.

In a proper 12 volt conversion for a frontmount coil, you need a correct 12 to 6 volt reducer and you also need the OEM ballast resistor wired inseries just like flashlight batterys. If you wire them side by side your going to melt you ignition coil. DO IT LIKE I TELL YOU, wire your resistors in series.

In a proper frontmount ignition system, the OEM 6 volt coil will read about 3.5 volts at the coil (3 min 4.5 max) with the points closed and battery volts with the points open. Any voltage other than what I have "quoted" is going to give you sparkie problems.

If you don't have a voltmeter, you can get a good digital voltmeter at the hardware store for less than $20, don't muck around, get one so you can correctly troubleshoot your tractor.

You don't know how to tell if your points are open or closed???? Simply put your tractor in gear and push on one of those great big rear wheels and watch your voltmeter, it will change when the points open or close. Don't bother trying to tickle the starter motor to turn the engine so that the points open or close. It only by accidently will stop where you want it. Do it by hand like I tell you.

I wish you well, and really care and want to help you get your tractor running again..... ..Dell

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Kent

12-10-2000 08:47:01




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 Re: Re: Re: Re: 2n won't start in reply to Dell (WA), 12-09-2000 18:16:05  
I will go directly and get the volt meter. On the conversion I have only the one resistor between the battery and the coil. The gentleman at the parts store was the one that told me the voltage dropped only to around 8v and would be okay. This was probably because they didn't have the correct resistor. The tractor is not run that often so I assume this made the coil last as long as it did. I will get another coil and the OEM resistor(is this all I need to know or are there different types of OEM resistors ie.6v,8v,12v.)Thanks Kent.

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Dell (WA)

12-10-2000 20:30:22




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 Re: Re: Re: Re: Re: 2n won't start in reply to Kent, 12-10-2000 08:47:01  
Kent..... there is only 1 OEM (original equipment manufacturer) ballast resistor and that is for the OEM 6 volt tractor system. And yes, that ballast resistor gets hot and smokes when new.

Wire 'em in series like flashlight batterys..... ..Dell



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Kent

12-11-2000 17:54:40




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 Re: Re: Re: Re: Re: Re: 2n won't start in reply to Dell (WA), 12-10-2000 20:30:22  
Dell; I got the volt meter. I talked to the local Ford tractor dealer and he said he did not know the term OEM, but did know and use a ballast resistor(apparently used in dodge vehicles). I went back and got another ballast resistor like the one I already had. They had a larger resistor that actually went 12v to 6v. My thinking would be that the ballast resistors hooked in series would reduce the voltage in steps12v-8v-4v? I think you think I should get the larger resistor 12v to 6v and then put the ballast resistor in series to bring the voltage down to the 3v to 4.5v. Sorry to keep bothering you, I hope to get it right soon( I will check hook-ups with volt-meter before I wreck another coil). Thanks,Kent

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