Patrick, I have the same problem from time to time. Check to see battery is fully charged. And with the 6V, it doesn't take but a 1 volt drop in resistance somewhere to reduce the volts enough to prevent a good start. Most often it's the points. It doesn't take much for them to have a tiny bit of corrosion set in after awhile especially after a period of rain or wet, thus blocking good contacts. Even after a slight filing with 600 grit paper, it starts after a couple of sandings, but, the coating is micro thin and two to three filings is all I can get off a set before chucking them into the woods, and putting a new set on with condensor. That does the trick most of the time. The next thing and usually the first thing I do is make sure every connection is tight, corrosion free, clean and bright...from the switch to gauges, all the way to the coil. Then I go through the points scenario I described above. If that doesn't work, I check for a possible ground inside the cap on the distibutor plate where the points mount. The main wire coming into the cap from the coil must not be touching the distributor plate or the distributor. Make sure it is properly insulated to prevent a grounding situation. Lightly sand the rotor and contacts inside the cap. Look inside the main lead on the top of the coil...clean the contact there on the wire and the coil itself...the inside of that where water may have set in there to start some corrosion. If you're getting current on the distibutor side of the coil and on the points themselves...it has to be a ground out or poor contact/corrosion issue...or weak battery. It could be the coil...as some posted, some new coils just are bad coils out of the box.
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