It looks as though Briggs & Stratton have terminated their agreement with Daihatsu Toyota, ending an era of quality Japanese built Vanguard engines.
Briggs Brings Commitment To Commercial Engines HomeThe Vanguard single cylinder engine was also built in Japan by Mitsubishi until 2007.
According to the 2016 Briggs & Stratton update seminar, all single cylinder engines are made in China with the only USA manufactured engine being the V-Twin 810 EFI engine.