I bought Vulcan brand Square Link Security Chain, and a boron steel hexagon shackle pad lock from Amazon , this stuff isn't cheap
But its a lot less than buying a new Generator or motorcycle,
Made my choices after watching some destructive testing videos online, a locksmith could not cut the. Chain using very large bolt cutters fasten down to his work bench , he used Ratchet Straps or hydraulic rams for applying force to the cutter handles, the cutter jaws gave out and broke with out cutting the chain,