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9n hard to start

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Mike Warrick

06-28-2007 12:22:24




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I have a 9n that has been completely rebuilt and restored. The only problem is starting it. The problem is when it"s cold or warm. It turns over fine , and has been changed to a 12 volt system. My best chance of starting is to turn on fuel, turn over motor 3-5 seconds, pull choke a couple seconds and let off key and it will usually start as I let off key. I checked for power at coil while I am turning over and it blinks fine. I feel that it is in the carb., but I have blown it out and tweeked it a little. I"m no stranger to mechanics but figured some of you that work on these more than I do may have some ideas. Thanks.. Mike

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Mike Warrick

06-28-2007 16:41:26




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 Re: 9n hard to start in reply to Mike Warrick, 06-28-2007 12:22:24  
Thanks everyone for diverting my attention away from the Carberator. It appears that it is starting nice and quick now. I found that there was some corrosion on a couple spade terminals and that was probably causing the current drop. This is a great website to give extra pairs of experienced eyes on any given problem and you are all greatly appreciated!!!!!
Mike



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Phil (NJ,Az,Sask)

06-28-2007 18:35:10




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 Re: 9n hard to start in reply to Mike Warrick, 06-28-2007 16:41:26  
[quote]I took off the ballast and it measures 3.1 ohms on my multimeter.[ /quote]

Glad you got her working! Just for reference; your measurement of

3.1 would not work on any 12V coil. That number is close to the 6 volt Coil.

If you were measuring 2 devices in series. One that is mounted on the distribution block between the 2 upper connection posts (thats the OEM Ballast) and another Resistor between that connection and the top of the COIL. You have the correct Combo for an OEM 6 volt coil

Regards,

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old

06-28-2007 15:20:31




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 Re: 9n hard to start in reply to Mike Warrick, 06-28-2007 12:22:24  
Starter maybe dragging and if it is it can cause you to have weak spark and thats why it starts when you let off on it. I would have it checked to make sure its not drawing to many amps



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Phil (NJ,Az,Sask)

06-28-2007 14:17:38




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 Re: 9n hard to start in reply to Mike Warrick, 06-28-2007 12:22:24  
Like Sounder', acts like Ignition. I am going to guess that you have FIXED Resistors in your coil circuit and you are operating near the LOW current Point.

1. High Voltage Drop @ Battery Cables (bad Connections).

2. If 6 Volt Coil you need OEM Ballast, and 2.2 Ohm 20 watt, Fixed R.

3. If 12 volt Coil you need OEM Ballast, and .5 Ohm 5 watt, fixed R

(some running OK with Just the OEM Ballast, no Additional R)

4. ignition switch

Automotive ignition resistors will "not" replace the OEM Ballast, the fault will be as you have described your problem. The voltage drop, during Starting, reduces current below limit

JMHO

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don b

06-29-2007 08:09:52




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 Re: 9n hard to start in reply to Phil (NJ,Az,Sask), 06-28-2007 14:17:38  
Phil.....you say... If 6 Volt Coil you need OEM Ballast, and 2.2 Ohm 20 watt, Fixed R.
I say....all the front mount dist. tractors worked just fine on just the OEM ballast resistor.Where is this additional 2.2 ohms coming from since all the 6v coils I have checked only have about 1 ohm of resistance.Would please explain. don b



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Mike Warrick

06-28-2007 15:55:21




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 Re: 9n hard to start in reply to Phil (NJ,Az,Sask), 06-28-2007 14:17:38  
I just bought the tractor so I didn't know what he had wired in. I took off the ballast and it measures 3.1 ohms on my multimeter. The coil and cap look brand new, I assume he put a 12 volt coil on. My luck is that none of the parts are marked... Where would I get the oem ballast and fixed R ? TSC ? Thanks.... Mike



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souNdguy

06-28-2007 12:38:45




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 Re: 9n hard to start in reply to Mike Warrick, 06-28-2007 12:22:24  
Starting when you let off the key is a -classic- weak spark problem.

Check yuor plugs, wires, points, connections, cap , and condensor, and ignition switch.

What kinda coil/resistor's you using?

Soundguy



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A. Bohemian

06-28-2007 14:28:32




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 What Does the Spark Look Like? in reply to souNdguy, 06-28-2007 12:38:45  
Get a spark plug. Open the gap to something like 3/16" and connect one of the spark lines to it. Now clamp the loose plug up against a good grounding surface, like the engine block or similar.

Most Kettering and modified Kettering systems will throw a wide, bright blue arc across the 3/16" gap with no problem. ("Look, Ma! Plasma!")

If the spark is yellowish or a very thin line or will not jump the full 3/16", it may not be strong enough to do fire the fuel/air mixture reliably under a wide variety of conditions.

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