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Briggs & Stratton 21R702-0087-G1 Vertical Engine

The Briggs & Stratton 21R702-0087-G1 is a dependable vertical-shaft replacement engine designed for compatible riding mowers, lawn tractors, and outdoor power equipment. Its 344cc single-cylinder OHV design produces 10.5 gross horsepower while encouraging efficient combustion, cooler operation, and longer valve life.

Key Features

  • Intek/PowerBuilt vertical-shaft engine
  • 344cc single-cylinder OHV design
  • 10.5 gross horsepower
  • Manual recoil starting
  • Dura-Bore cast-iron cylinder sleeve
  • Electronic ignition system
  • Float-style carburetor
  • Cartridge-style air cleaner
  • Mechanical governor
  • Air-cooled operation
  • Muffler included
  • No battery or electric-start wiring required

Specifications

Specification Details
Brand Briggs & Stratton
Model 21R702-0087-G1
Series Intek / PowerBuilt
Engine type Single-cylinder, four-stroke OHV
Shaft orientation Vertical
Displacement 344cc
Gross horsepower 10.5 HP
Starting system Recoil start
Crankshaft diameter 1 inch
Crankshaft length 3-5/32 inches
Shaft keyway 1/4 inch
Shaft end Drilled and tapped 7/16-20
Shaft rotation Counterclockwise from PTO side
Mounting bolt circle 10 inches
Maximum speed 3,600 RPM
Oil capacity 48 oz / 1.5 qt
Lubrication Splash
Cylinder sleeve Dura-Bore cast iron
Compression ratio 8.5:1
Ignition Electronic
Carburetor Float type
Governor Mechanical
Air cleaner Cartridge style
Choke control Manual
Cooling system Air-cooled
Fuel type Gasoline
Fuel pump Not included
Fuel tank Not included
Muffler Included
Low-oil alert/shutdown No
Superseded by 21R702-0065-G1

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