points problem or coil ?

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Rob in NH
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points problem or coil ?

Postby Rob in NH » Sun Aug 20, 2017 8:25 pm

I've been having some trouble with the 67 cub, about a month ago it started running lousy, misfiring, almost as if you were shutting the key off an on. I thought it was the coil, replaced it, it was no better. Replaced the points and it ran excellent. Happened again , ended up changing the points and fixed the problem. Today i was mowing the field and ran good all day, stopped for dinner and went back out and it ran bad again. I didn't have any points so used some sandpaper and cleaned the points and reset them. It started up and ran good but don't really have a good feeling about the cub right now. What do you think is causing the points to do this? Should i put an external resistor to cut the voltage to the points?
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Re: points problem or coil ?

Postby Peter Person » Sun Aug 20, 2017 8:53 pm

Rob,
Is there any evidence of arcing inside the distributor cap?

Peter
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Rob in NH
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Re: points problem or coil ?

Postby Rob in NH » Sun Aug 20, 2017 8:55 pm

not sure but i did try swapping the cap with another , no change.
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staninlowerAL
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Re: points problem or coil ?

Postby staninlowerAL » Sun Aug 20, 2017 9:15 pm

Is the ignition system 12v? If so is the coil you're using a 12v with internal resistor? If it is, it should be OK. If not then a resistor will probably help.

Rob in NH
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Re: points problem or coil ?

Postby Rob in NH » Sun Aug 20, 2017 9:18 pm

it is 12v, i'll have to call to find out if it has a resister, it isn't stamped that it has one.
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staninlowerAL
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Re: points problem or coil ?

Postby staninlowerAL » Sun Aug 20, 2017 9:25 pm

Rob in NH wrote:it is 12v, i'll have to call to find out if it has a resister, it isn't stamped that it has one.
Worth checking out IMHO. I seem to remember that the power to the points should be about 4.5v but I could be wrong. Someone will probably correct me (and that's OK.)

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Don McCombs
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Re: points problem or coil ?

Postby Don McCombs » Sun Aug 20, 2017 10:14 pm

The NAPA number for the 12V IR coil is IC14SB.
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Re: points problem or coil ?

Postby Scrivet » Mon Aug 21, 2017 6:42 am

Rob in NH wrote:......... I didn't have any points so used some sandpaper and cleaned the points and reset them. .........
The anti sandpaper crowd must be sleeping to have not admonished you for this. I really don't know one way or the other, but enjoy the academic discussions. If you search you'll find all kinds of "woe be unto you" for even having sandpaper visible when the distributor cap is removed, much less actually touching sandpaper to points.

Rob in NH
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Re: points problem or coil ?

Postby Rob in NH » Mon Aug 21, 2017 6:48 am

I've always used sandpaper and its worked for me with good results.
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Stanton
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Re: points problem or coil ?

Postby Stanton » Mon Aug 21, 2017 7:36 am

Scrivet wrote:
Rob in NH wrote:......... I didn't have any points so used some sandpaper and cleaned the points and reset them. .........
The anti sandpaper crowd must be sleeping to have not admonished you for this. I really don't know one way or the other, but enjoy the academic discussions. If you search you'll find all kinds of "woe be unto you" for even having sandpaper visible when the distributor cap is removed, much less actually touching sandpaper to points.


I was thinking the same thing, Scrivet. :)
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Re: points problem or coil ?

Postby Shane Nelson » Mon Aug 21, 2017 7:48 am

Jim Becker explained it to me about using sandpaper instead of a file. If you use a piece of sandpaper the sand comes off and embeds into the points and they don't last as long. Use a file and it doesn't come apart. It made sense the way he explained it to me because when you use a piece of sandpaper it does wear down and you have to replace it, a file not so often.
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Rob in NH
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Re: points problem or coil ?

Postby Rob in NH » Mon Aug 21, 2017 7:52 am

I don't have a points file so i use what i have.
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Shane Nelson
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Re: points problem or coil ?

Postby Shane Nelson » Mon Aug 21, 2017 8:03 am

Rob in NH wrote:I don't have a points file so i use what i have.

Oh don't get me wrong, I'm all about using what you have. I've used sandpaper more than a file over the years but I never thought about it until Jim told me.
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Re: points problem or coil ?

Postby Waif » Mon Aug 21, 2017 8:21 am

Ha,ha...
I've dragged a dollar bill through multiple points to clean them. ( Note,not to dress them) A gentle tension on the arm to reduce number of trips through.

Not sure Rob: what's shortening your point life. Moisture or dust getting in maybe....or staggered voltage. Coolant in a ignition system can really raise havoc.

Being your symptom acts like a switch being jiggled, check that switch and any similar or related connections, for a loose connection or contact .
Last edited by Waif on Mon Aug 21, 2017 8:23 am, edited 1 time in total.

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bob in CT
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Re: points problem or coil ?

Postby bob in CT » Mon Aug 21, 2017 8:23 am

How about the condenser? If your points are transferring material from one side to the other, it is the condenser. Point quality suffered when production shifted to China because of tungsten quality. Impurities in the metal can leave an oxide on the surface. A friend of mine that used to work for the phone company gave me a telco diamond points file. What a great tool to have. I installed a Pertonix in a three of my tractors, but I just had to pull one out of my 1950 project tractor when I couldn't start it for the first time. Put the points in and it started right up. Still a fan, though, as the timing stays right on and never changes with rubbing block wear.


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