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Briggs & Stratton Powerbuilt OHV Vertical Engine — 500cc, 1in. x 3 5/32in. Shaft, Electric Start, Model# 31R907-0007-G1
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Briggs & Stratton Powerbuilt OHV Vertical Engine — 500cc, 1in. x 3 5/32in. Shaft, Electric Start, Model# 31R907-0007-G1

Item# 42552
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Only $529.99

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Ships Truck 81.0 lbs
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Manufacturer's Warranty: 2 years consumer use / 1 year commercial use

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Product Summary

The Briggs & Stratton Powerbuilt™ 500cc Engine features 12V electric start, rewind backup and a 9 Amp DC alternator. The exhaust manifold and muffler are included but fuel tank is omitted. For use on riding lawn mowers, wide area walk-behind mowers and trail mowers. Emission-compliant engine is for sale in all 50 states.

What's Included

  • (1) Engine with electric start

Features + Benefits

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  • Dura-Bore™ cast iron cylinder sleeve for extended life
  • Maintenance-free Magnetron® electronic ignition and float carburetor for consistent, easy starts
  • Dual-Clean™ dual-element air cleaner for maximum protection
  • Patented balancing system for smoother performance
  • Gear-driven DuraLube™ splash lubrication bathes all internal engine parts with oil
  • Tool-less air filter cover for easy access
  • Heavy-duty Teflon sleeve bearing withstands load and reduces wear
  • Automotive dipstick makes checking oil levels easy

Key Specs

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Item#42552
Ship Weight81.0 lbs
Engine Displacement (cc)500
Start TypeElectric
ApplicationRiding mower, lawn tractor, trail mower
Engine TypeIntek
Shaft OutputVertical
Crankshaft1 x 3 5/32
Shaft Diameter (in.)3 5/32
Shaft Length (in.)1
Shaft Keyway (in.)1/4
Shaft End Tapped (Diameter (in.)/Threads per inch)7/16-20
Shaft Rotation (From PTO Shaft Side)CCW
Gear ReductionNo
Bearing TypePlain
Cylinders (qty.)1
Cylinder BoreCast iron
Bore x Stroke (in.)3.56 x 3.06
Compression Ratio8.5:1
Cooling SystemAir cooled
Air Cleaner TypeDual element
Fuel TankNot included
Fuel TypeGasoline
Fuel PumpYes
Fuel FilterYes
Oil Capacity (qt.)1 1/2
Lubrication SystemSplash
Low Oil AlertNo
Low Oil ShutdownNo
Ignition SystemElectronic
Governor SystemMechanical
CarburetorFloat
Throttle ControlRemote
Choke ControlManual
Max. RPM3,300
Charging System Amps9
Muffler IncludedYes
Flywheel BrakeNo
Auto Compression ReleaseYes
Bolt Circle (in.)10
Dimensions L x W x H (in.)19 x 16 x 13
EPA/CARB Approval (California Air Resource Board)Yes

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Extended Warranty

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Service Protection Plus

Manufacturer Warranty:
2 years consumer use / 1 year commercial use

Protect your purchase beyond the manufacturer's warranty
with Service Protection Plus!

DESCRIPTION (Click More Info for details) 1 Year Extension 2 Year Extension
Repair Plan
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Repair Plan with Accidental Damage
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Briggs & Stratton Powerbuilt OHV Vertical Engine — 500cc, 1in. x 3 5/32in. Shaft, Electric Start, Model# 31R907-0007-G1 The price is $529.99.
Briggs & Stratton Powerbuilt OHV Vertical Engine — 500cc, 1in. x 3 5/32in. Shaft, Electric Start, Model# 31R907-0007-G1
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Item# 42552
In Stock Online
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Hide Similarities
Engine Displacement (cc)
500 540 540 500 570
Start Type
Electric Electric Electric Electric Electric
Application Riding mower, lawn tractor, trail mower Riding mower Riding mower, lawn tractor Riding mower, lawn tractor Commercial mower, lawn tractor
Engine Type Intek Intek OHV Intek–OHV Intek–OHV Vanguard V-Twin OHV
Rated Power (HP)
- - - 17.5 18
Shaft Output
Vertical Vertical Vertical Vertical Vertical
Crankshaft 1 x 3 5/32 1 x 3 5/32 Tapped 7/16–20, keyway, 1 in. dia. - -
Shaft Diameter (in.) 3 5/32 1 1 1 1
Shaft Length (in.) 1 3 5/32 3 5/32 3 5/32 3 5/32
Shaft Keyway (in.)
1/4 1/4 1/4 1/4 1/4
Shaft End Tapped (Diameter (in.)/Threads per inch) 7/16-20 7/16-20 7/16–20 7/16–20 7/16–20
Shaft Rotation (From PTO Shaft Side) CCW Counterclockwise Counterclockwise Counterclockwise Counterclockwise
Gear Reduction No No - - -
Bearing Type
Plain Plain Plain Plain Plain
Cylinders (qty.)
1 1 1 1 2
Cylinder Bore
Cast iron Cast iron sleeve Cast iron Cast iron Cast iron
Bore x Stroke (in.)
3.56 x 3.06 3.70 x 3.06 3.70 x 3.06 3.56 x 3.06 2.83 x 2.76
Compression Ratio 8.5:1 8.5:1 - - -
Cooling System
Air cooled Air cooled Air cooled Air cooled Air cooled
Air Cleaner Type
Dual element Cartridge style dual element Dual element Dual element Dual element
Fuel Tank Not included Not included Not included Not included Not included
Fuel Type Gasoline Gasoline Gasoline Gasoline Gasoline
Fuel Pump
Yes Yes Yes, Pulse Yes, (Pulse) Yes
Fuel Filter Yes Yes Yes - -
Oil Capacity (qt.)
1 1/2 1.5 1.5 (48 oz.) 1.5 (48 oz.) 1.5 (48 oz.)
Lubrication System
Splash Full pressure Full pressure Splash Full pressure
Low Oil Alert
No No No No Yes
Low Oil Shutdown No No No - -
Ignition System
Electronic Electronic Electronic Electronic Electronic
Governor System
Mechanical Mechanical Mechanical Mechanical Mechanical
Carburetor
Float Float Float Float Float
Throttle Control
Remote Remote Remote Remote Remote
Choke Control Manual Manual Manual - -
Max. RPM
3,300 3,600 3,300 3,300 3,300
Charging System Amps 9 9 9 9 16
Muffler Included
Yes Yes Yes Yes No
Flywheel Brake No - - - -
Auto Compression Release
Yes Yes Yes No No
Bolt Circle (in.)
10 10 10 10 10
Dimensions L x W x H (in.)
19 x 16 x 13 19 x 16 1/2 x 16 1/2 19 x 16 1/2 x 13 19 1/2 x 16 1/5 x 12 1/2 16 7/8 x 16 1/16 x 13 1/8
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes