Melting around the battery terminal is a dead giveaway for a poor connection. If the cables themselves are hot, they're way too small. Being positive or negative ground has nothing to do with it, but being 6 volt does. Warm engines are tighter than cold ones and typically harder to turn over if the battery is marginal or the cables are too small.
6 volt starters draw twice the current than equivalent size 12 volt starters do, plus a lot of automotive type cables are designed for small car engines which use relatively small starters & don't draw a lot of current.
6 volt starter cables should be at least 1/0 or 2/0 wire size. What you typically find at the corner auto parts store is #4, which is three or four sizes too small for a 6 volt system.
Any place that deals with heavy equipment or over the road trucks can make you cables. Just give them the length and the size of the lug(s) on the end. NAPA can order them, but they're expensive. I've also made my own using welding cable and crimp/solder terminals.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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