Ford 9N gets sick after twenty munites of work.

The carb has been rebuilt, new gas tank, new fuel line, new sed bulb asembly. New plugs, and the front mound dist looks fine and we cleaned the points.

In order to remove the spark plugs, I had to pull the head, and heat two of the busted off spark plugs. When I did, there was absolutly no ring grove at all, so I would assume the valves were ground at the time it was overhauled.

It has a new battery (6) volt, but the starting is sluggish, it has new battery cables.

The thing ran like a million dollars till we put the belley mower on it a actualy gave it a work out. Now after twenty munites, it starts to miss to the point it can not power itself on the level in low gear.

The past three times we run it this has happened, but we always charged the battery prior to starting, I'm wondering if the battery is going dead, and shutting down the spark. I so far have not checked the coil, but I did pull a couple plugs in case they were fouling --to jump the spark--that did not help at all.

Now I'm wondering if the valves could be the issue? I'm sorry, I just haven't had time to mess with it like I should have to find the problem. Any other suggestions that I may be overlooking?

Thanks

I would think that you might be looking at the coil. Pretty common ailment in the N series.

Could be the ignition switch too, try attaching a jumper wire to the switch terminals next time this happens and see if that makes any difference.

Try this, when the engine is running strong take one of the battery cables off for a brief moment. If the engine shuts off when you do that, the charging system isnt working and you are suckin your batttery dry. good luck

Try a new condenser.
Brian(MN)

I'm with everyone, but I would think the switch would make it cut out, not miss real bad? I don't pretend to know the answer, but that would be my way of thinking.

I will update everyone, and certianly appreciate the posts.

Will do. Thanks very much!

Great idea, kinda makes a real good way of thinking---I have never thought of that, and we do even have a fast disconect on it.

Thank you very much, and I will post the results when I find out.

ill go with the coil too, 20 minutes of makin her snort is just right to get the old coil nice and toasty and melt the goo stuff inside it

If its any consolation, I kind of get sick after 20 minutes of work, too. And I'm not even as old as your N!

go to the 2n 8n 9n and ask dell he knows alot!

Doing what you say can fry a charging system depending on the set up. An also if it has an alternator it will fry the alternator and believe it or not if CAN KILL you because the regulator will see a dead battery and an alternator can put out 90 volts at more then 60 amps and those number mean dead man if you get hold of the wrong wire

You may have a loose intake manifold. I've seen engines miss when warm then idle nicely when cool.

Make sure the air vent is open in the gas tank. David..............

Could very well be the coil too.
Brian(MN)

Most of my inlaws get sick of me in seconds. But all in all I tell the wife I like her inlaws better than I like mine.

Thanks everyone for now, lots of good ideas here, and it took only a very short time. I will report back, I did not have time to see if the coil was hot, as often they are.