I'll go with the broken ground. Mine was becoming more & more difficult to start over a period of time, and then stopped cranking altogether. Advice on this forum mentioned the ground strap.... which is stranded, and the strands had been breaking, a few at a time, over a year or two. When the last couple of pieces broke, everything electrical would work EXCEPT the starter.
Replaced the ground cable (with a slightly longer one), and added a second on the other side for "insurance." Tractor then started like it just received a new battery! That starter pulls a boatload of amps, and it ALL has to pass through that ground strap- no other ground is heavy enough for it.
Couple years later now, with 350 hrs, and all is still good. I love that little tractor!
Replaced the ground cable (with a slightly longer one), and added a second on the other side for "insurance." Tractor then started like it just received a new battery! That starter pulls a boatload of amps, and it ALL has to pass through that ground strap- no other ground is heavy enough for it.
Couple years later now, with 350 hrs, and all is still good. I love that little tractor!