This manual pertains to 3 to 11 HP 4-cycle L-head engines found in a range of models including ECV100-120, H22-80, HH40-70, HM80, HM70-100, HMSK70-110, HMXL70, HS40-50, HSK30-70, HSSK40-50, HT30-35, HXL35, LAV30-50, LEV80-120, TNT100-120, and TVM125-220. These engines are engineered for robust performance and reliability across various applications. This comprehensive guide provides essential information for the maintenance, repair, and operation of the specified engines. It includes detailed procedures for routine servicing, troubleshooting common issues, technical specifications, and safety precautions. Owners, technicians, and mechanics will find this manual invaluable for ensuring the optimal performance and longevity of their equipment.