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8N has not spark
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Problem Solved

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Brad Hingle

07-08-2003 04:44:23




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Just writing to thank everyone for the help. My 8N had no spark, would not start. After changing the points and condensor and a new coil and still no spark, the spark plug wires, rotor, cap and plugs were all new already. The pig tail spring from the coil was making good contact with the points. The points were not shorted to ground. The cork gasket was not inbetween the pigtail spring and the points, I even stretched the pigtail spring a bit to make sure I had good contact with the points. I even learned how to check a coil, turns out my old coil was good too. My points were worn but not stuck closed. Someone suggested the resistor that drops the voltage from 12 to 6 volts, mind read 9 volts, I was reading this voltage at the coil. So I figured this was good even though high. I happen to check the voltage while I was cranking and the voltage would drop below 1 volt at the coil. When I would stop cranking, the voltage would return to 9 volts. That's why I never thought the resistor was bad cause I would read 9 volts with the ignition on, even though that's high. But it is when a load was placed on the resistor, the voltage would drop too low, hence not enough voltage to develope enough spark. So I bought a new resistor. With the engine ignition on the voltage reads 12 volts at the coil, with the engine running, the voltage reads just under 6 volts. After discovering the low voltage while cranking, I ran a jumper from the battery straight to the coil, tried starting it, an it cranked right up. Thinking back, I did this on the first day when the 8N would not start. But when I hooked the jumper up that day, I think I had already flooded the engine, because after it would not start, I started trying to give it more gas, pulling the choke, etc. Then I hooked up the jumper. Normally, it starts with no choke, throttle all the way down, one revolution and it's running, And ... that's the way it starts once again. So I'm back in business. Thanks for all of he help guys!!

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Danny in CO

07-08-2003 08:30:06




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 Re: 8N has not spark - Problem Solved in reply to Brad Hingle, 07-08-2003 04:44:23  
Brad,

If you are still using a 6 volt coil, 6 volts at the top of the coil with the points closed is too much. Your coil will eventually fail from too much voltage. You need about 3.5 volts with the points closed and battery voltage (about 12 volts) with the points open. You need the original ballast resistor AND a 12 to 6 volt dropping resistor in line to the coil. If you are running a 12 volt coil, you should have only a .5 ohm 10 watt resistor in line to the coil.

Good luck,
Danny

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Lou VA

07-08-2003 06:31:21




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 Re: 8N has not spark - Problem Solved in reply to Brad Hingle, 07-08-2003 04:44:23  
Thanks, Brad. We all are grateful when someone finds the cause for problems and lets us know. It could happen to any one of us too. You may have saved someone a lot of time trouble shooting. Resistors are so cheap too.



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