Re: 8n runs until hot

Since it has been converted to 12 volts I would check to make sure it has the orginial ballast resister and if it still has the orginial style 6 volt coil, that it has an aditional reistor. If you have a 12 volt coil then the ballast resistor is the only one required. Either way you need the ballast resistor. I would run it until the problems happens and right then check to see what kind of spark you have. You might check it before you run it to get a comparision to go by.

It also could be the ignition switch getting hot and failing. Make a jumper to bypass it and see what happens.

When parts in an electrical circuit gets hot the resistance increases and current flow decreases.

If you have a volt meter you can check for voltage at the top of the coil also. It will be a lot lower when the points are closed than when they are open.

You can crank the engine over and watch the amp meter. It should show more discharge when the points are closed and less when they are open. look for the movement.

The most important thing you can do is to check for spark as soon as you have the problem. Once you determine if you have a good spark or not, you iwll know what direction to go in.

You can make a test plug from an old spark plug. Open the gap up to 3/16". Should jump that much and be a fairly blue spark. Like I said check it both cold and hot.

Keep us posted

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