Not much of a question in there... more like a statement.
I suppose you're trying to ask whether reversing the coil connections might make it start faster when cranking on 6 volts, and the answer to that would be "probably". If you've already switched them and it's still slow to start on 6 volts and you know for sure that all of your connections are good and clean, then maybe the starter is beginning to go bad, which could draw down the voltage at the coil while it's cranking, or maybe the battery is getting weak. When you're jumping the starter from a 12 volt battery the only thing the 6 volt battery needs to do is provide the voltage for the coil, but when you're starting it from the 6 volt battery, it has to turn the starter and provide the voltage to the coil, so either the battery is weak or something is drawing down the voltage.
An easy test to see if the spark is the problem when trying to start it on 6 volts would be to pull a spark plug wire and hold it near a good ground when you're cranking the starter with the 6 volt battery. You should see a bright blue/white spark that should jump at least a 1/4 inch gap to ground. You can repeat the same test while you're jumping the starter with the 12 volt battery to see how much of a difference it makes in the quality of the spark.
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