MTD Throrx engines are made by Kohler and Briggs and Stratton. Some Thorx small engines, for use in chainsaws, are made by Walburo Inc.
Troy-Bilt is a brand name of MTD. MTD currently makes all of their own engines in China.
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Tecumseh made most, Briggs and Straton engines were used, but not many.
MTD Powermore engines are made by Zongshen, a Chinese company best known for manufacturing motorcycles and motorcycle engines.
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One can purchase MTD parts from the following retailers: "MTD parts", "Sears", "MTD products", "Quality Outdoor Parts", "Jacks Small Engines", one can search by entering the part or model number for the part one is looking for.
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