Briggs & Stratton Corp. announced that it will close a plant in Tennessee and shift the work to Georgia, eliminating about 690 jobs in the U.S., as it adjusts to a changing market for outdoor equipment. The company is also closing a plant in the Czech Republic, which will result in 77 job cuts there. It is shifting that work to a Kentucky factory. The moves reflect sharp declines in demand for U.S. lawn and garden products. The changes will save the company $18 million to $20 million a year before taxes.