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8N ignition

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Tim B.

05-29-1999 05:56:12




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I have a 52 model 8n that suffers from a low speed missfire. I have replaced everything with new parts, plugs, wires, points, etc. It is still a six volt positive ground system. I noticed that the wire from the coil to the distributor comes off the positive side of the coil is this correct?
The wiring diagrams I've seen does not specify. Any and all help is appreciated.




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AL@NC

05-29-1999 09:26:43




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 Re: 8N ignition in reply to Tim B., 05-29-1999 05:56:12  
Just a note. A vacuum leak will cause rough idle and smooth out at higher rpm's and under a load. They are easy to detect by spraying starter fluid or WD40 around the manifold.



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Dell (WA)

05-29-1999 06:32:10




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 Re: 8N ignition in reply to Tim B., 05-29-1999 05:56:12  
Tim..... ...the rule is: "coil plus to battery plus" Your 8N is positive ground, therefore the coil plus goes to ground THRU the points.

Sometimes finding a "miss" is just plain ol' luck. You've hit the obvious, did you replace the rotor and the cap?

While the general rule is: adjust carb idle mixture for maximum rpms, you just might be a "tad" lean, try 1/8 turn out, anti-clockwize. Obviously, if that makes it worse, try 1/8 turn in from where you started from. If that still doesn't work, adjust the idle mixture for max rpms, at least you'll be where it should be. Altho, there is one N-Board member that claims 90% of all carb problems are found in the ignition system.

Hope this helps..... ...Dell

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Tim B.

05-30-1999 17:33:49




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 Re: Re: 8N ignition in reply to Dell (WA), 05-29-1999 06:32:10  
Thanks for the help. I decided to look more closely at the carb. I went to ncomplete.com and used their carb adj. directions. I found that my idle mixture screw does not seem to be working. I turned it all the way in and it did'nt affect my idle in the least. So I expect that my miss at idle is connected to this. So I guess I'll be up to my elbows in carb soon. Thanks again



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Dave B

05-31-1999 11:58:21




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 Re: Re: Re: 8N ignition in reply to Tim B., 05-30-1999 17:33:49  
Sounds like your idle jet or passage is clogged. Just for reference when you get to the point where adjusting your idle screw makes a difference. Turning the needle in (clockwise) richens the mixture and turning the needle out (counter-clockwise) leans the mixture. I would take the idle screw out and try to squirt some carb cleaner into the hole with the plastic straw that comes on most cans. Most of it will probably shoot out the air intake hole that the needle screws into. But it won't hurt and might solve your problem.

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