I too have a 300 utility, 6 volt system,7300 hrs+. The wiring is origional (cracked insulation, etc). It will frost the carb too in cool damp weather and runs better after the frost melts. But it always starts right up to 10 above. I change the points and plugs about every 2-300 hrs. It is cold natured and likes the choke, but it will run smooth and pull right out of the barn if I partially choke it. So first of all I wonder if your choke closes fully when you pull the cable out and opens fully when you push the cable in. You can observe this externally with the lever on side of carb, or remove the intake hose. Secondly take a test light (or volt meter) and measure voltage at battery side of coil with key on. If no voltage you have lost power (voltage) from key, if ok check distributer side of coil at the points inside the cap; open and close points with a screwdriver, without grounding out the points, hold the coil wire 1/4" from block and if all is well it will spark when you work the points with screwdriver and your test light on the points go off and on. You can have a bad coil. You can have a bad condensor which will ground out the points. Your points can be out of adjustment. They set at .023 on high part of the lobe. The points rubbing block has to be on the flat part of distributer lobe to make it spark with screwdriver. You also can have a bad rotor button which won"t let the spark go thru to each terminal inside the cap. It is not generator or voltage regulator related. As far as why = coincedence? I hope this helps ; I don"t type well and understand things way better than I explain them. Good luck, MARK. p.s. I have had bad points before, brand new.And bad condensor.
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