If this is 6V, I assume it has a generator on it. I am pretty sure the generators require positive ground unless you have one that is reverse polarized, but I do not know why you would. For starting the generator can be disconnected to make that a non-issue. It will run fine without the generator for a few minutes. At least long enough to get it started to see what else is wrong. Coils are usually marked positive or negative ground. I do now know what this one has, or if it is even has a 6V coil. I am not a coil expert, but I can see a 12V coil, or a 6V coil installed backwards (wrong terminal relative to ground) causing problems. Especially if you are trying to run a 6V system negative ground with a coil that is expecting a positive ground. A 6V battery with a 12V coil would most certainly not work.
Bottom line: put the battery in positive ground to match the generator. Then make sure you have a 6V coil installed, also with positive ground. (Note: my 340 had its coil in backwards and still ran, so this may not matter). Link provided to some interesting reading about coils. I make no claim to its accuracy.
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