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My 1987 JS550 just stopped. My son had been riding on a private pond that is clear, and as he was turning it lost power and died and we have been unable to get it to start. I have returned home and set it up in the garage and started working. Before the machine died it was making a ringing...

I have the same problem after a lot of tinkering I talked to a shop in the Ozarks and the mechanic said stop wasting time and put new pistons and rings in. He said I would be chasing a carb problem around and around. So I bit the bullet and tore it down finding scored pistons and worn rings...