This is the Briggs & Stratton Commercial Series EFI/ETC 27 HP 810cc Vertical Shaft Engine 49X977-0015-J1.

This model features Electronic Fuel Injection (EFI) and Electronic Throttle Control (ETC), designed for durability in heavy commercial applications like riding mowers.

Features:

• Patented 5-Step Debris Management System for extended durability under heavy debris conditions
  
• EFI / ETC
  
• Increased cylinder block structure for added strength and durability
  
• Cooling fin inspection panels speed debris inspection and cleaning
  
• Full pressure lubrication with spin-on oil filter assures controlled lubrication for extended component life
  
• Buyer protection package provides three-year limited commercial engine warranty

Product Specifications:

• Power Output: 27 HP (horsepower)
  
• Engine Displacement: 810cc
  
• Cylinders: V-Twin design
  
• Shaft Mounting: Vertical
  
• Shaft Size: 1-1/8" Diameter x 4-5/16" Length, tapped 7/16" with a 1/4" keyway
  
• Fuel System: Electronic Fuel Injection (EFI) / Electronic Throttle Control (ETC)
  
• Cooling System: Air-cooled with patented 5-step Debris Management System
  
• Lubrication: Full pressure lubrication with a spin-on oil filter
  
• Oil Capacity: 2.1 US quarts (2.0 L)
  
• Starter Type: Electric start
  
• Alternator: 20 Amp
  
• Emissions Certification: EPA compliant (not for sale in California)