This manual covers the Wisconsin TRA-10D and TR-10D engines, designed for repair, parts lookup, and routine maintenance. Wisconsin engines are recognized for their robust engineering and reliability, ensuring consistent performance in demanding applications. This documentation provides essential information for understanding and operating these small engines effectively. The scope of this manual encompasses factory-official operator and owner information, including general details, safety precautions, basic operation, and routine maintenance procedures. It features illustrated parts lists and exploded views to aid in identification and repair. This comprehensive guide is intended to assist owners, mechanics, and technicians in maintaining the optimal condition and functionality of their Wisconsin engines.