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Briggs & Stratton 31R977-0029-G1 Vertical Engine

The Briggs & Stratton 31R977-0029-G1 Intek Series Engine delivers reliable replacement power for riding lawn mowers, lawn tractors, and compatible outdoor equipment. Its 500cc single-cylinder OHV configuration produces 17.5 gross horsepower while promoting efficient combustion, cooler operating temperatures, and extended valve life.

Key Features

  • Intek Series riding-mower engine
  • 500cc single-cylinder OHV design
  • 17.5 gross horsepower
  • Electric start with recoil backup
  • 3-amp charging system
  • Magnetron electronic ignition
  • Dura-Bore cast-iron cylinder sleeve
  • Full-pressure lubrication
  • Replaceable oil filter
  • Integrated fuel pump
  • Tool-free air-cleaner cover
  • Maximum operating speed of 3,300 RPM

Specifications

Specification Details
Brand Briggs & Stratton
Model 31R977-0029-G1
Series Intek Series
Engine type Single-cylinder, four-stroke OHV
Shaft orientation Vertical
Displacement 500cc
Gross horsepower 17.5 HP
Starting system Electric with recoil backup
Charging system 3 amp
Crankshaft diameter 1 inch
Crankshaft length 3-5/32 inches
Shaft keyway 1/4 inch
Shaft end Drilled and tapped 7/16-20
Maximum speed 3,300 RPM
Oil capacity 48 oz / 1.5 qt
Lubrication Full-pressure
Oil filter Replaceable
Cylinder sleeve Dura-Bore cast iron
Ignition Magnetron electronic
Fuel pump Included
Cooling system Air-cooled
Air cleaner Pleated-paper filter
Fuel type Gasoline
Warranty 2-year consumer / 1-year commercial
UPC / GTIN 047282028391 / 00047282028391

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