This is the Briggs & Stratton Horizontal EFI/ETC Engine 61A277-0111-J1.

Briggs & Stratton Engines are engineered to provide reliable and efficient power for a wide range of outdoor applications.

This engine is often used in outdoor power equipment, identified as part of the 61A277J series, specifically associated with the code AD0001. It's a 993cc engine with a specific crankshaft (1-1/8" x 4") and is a genuine OEM replacement part.

Product Specifications:

• Type: Horizontal Engine
  
• Series: 61A277J
  
• Code: AD0001
  
• Features: EFI/ETC (Electronic Fuel Injection/Control)
  
• Crankshaft: 1-1/8" x 4", 0.438-20 UNF End Tapped, 1/4" Keyway
  
• Application: Powers various outdoor equipment.

Note: Due to the nature of engines and the inability to verify installation, handling, or operating conditions once delivered, this product is not eligible for return.