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Briggs & Stratton 31S977-0005-G1 Vertical Engine

The Briggs & Stratton 31S977-0005-G1 Vertical Engine delivers dependable power for compatible riding lawn mowers, garden tractors, and professional turf equipment. Its 500cc single-cylinder configuration produces 17.5 gross horsepower for consistent performance under demanding mowing conditions.

Key Features

  • Professional Series engine
  • 17.5 gross horsepower
  • 500cc single-cylinder configuration
  • Vertical crankshaft
  • Overhead Valve technology
  • Dura-Bore cast-iron cylinder sleeve
  • Full-pressure lubrication
  • Replaceable oil filter
  • Dual Clean air filtration
  • Anti-vibration system
  • Electric starter
  • Magnetron electronic ignition
  • Fuel pump
  • 9-amp charging system

Specifications

Specification Details
Brand Briggs & Stratton
Model 31S977-0005-G1
Series Professional Series
Engine Type Single-cylinder OHV
Shaft Orientation Vertical
Gross Power 17.5 HP
Displacement 500cc
Crankshaft Diameter 1 inch
Crankshaft Length* 3-5/32 inches
Crankshaft End Drilled and tapped, 7/16-20
Keyway 1/4-inch square
Starter 12-volt electric gear drive
Ignition Magnetron electronic
Charging System 9-amp DC alternator
Lubrication Full-pressure with oil filter
Fuel Pump Included
Oil Capacity Approximately 48 fl oz
SKU / MPN 31S977-0005-G1

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