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Briggs & Stratton Powerbuilt Vertical Replacement OHV Engine with Electric Start — 500cc, 1in. Dia. x 3 5/32in.L Shaft, Model# 31C707-3026-G5
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Briggs & Stratton Powerbuilt Vertical Replacement OHV Engine with Electric Start — 500cc, 1in. Dia. x 3 5/32in.L Shaft, Model# 31C707-3026-G5

Item# 24921

Only $529.99
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Manufacturer's Warranty: 2 years consumer use / 1 year commercial use

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Product Summary

This Briggs & Stratton Powerbuilt™ Vertical Replacement OHV Engine with electric start is a perfect replacement engine for riding lawn mowers and lawn tractors that require electric start engines.

What's Included

  •  (1) Engine, Model# 31C707-3026-G5

Features + Benefits

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Features for Briggs & Stratton Powerbuilt Vertical Replacement OHV Engine with Electric Start — 500cc, 1in. Dia. x 3 5/32in.L Shaft, Model# 31C707-3026-G5
  • Gear-driven DuraLube™ splash lubrication system bathes all internal engine parts with oil
  •  Easy access to air filter thanks to tool less cover
  •  Heavy-duty teflon-coated sleeve bearing withstands load and reduces wear
  •  Automotive-style dipstick makes checking engine oil levels easy
  •  Cast iron cylinder sleeve for extended life
  • Float carburetor for consistently easy starts
  • Electronic ignition for quick, dependable starts
  •  Dual element air cleaner provides protection for longer engine life
  • OHV design for cooler operation and longer valve life
  • AVS® patented balancing system for smoother performance

Key Specs

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Item#24921
Ship Weight81.0 lbs
Engine Displacement (cc)500
Start TypeElectric
ApplicationRiding mower, lawn tractor
Engine TypeOHV
Rated Power (HP)17 1/2
Shaft OutputVertical
CrankshaftTapped 7/16-20, Keyway, 1 in. dia.
Shaft Diameter (in.)1
Shaft Length (in.)3 5/32
Shaft Keyway (in.)1/4
Shaft End Tapped (Diameter (in.)/Threads per inch)7/16-20
Shaft Rotation (From PTO Shaft Side)Counterclockwise
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 Tank Capacity (qt.)17
Fuel PumpNo
Fuel FilterYes
Oil Capacity (qt.)1 1/2
Lubrication SystemSplash
Low Oil AlertNo
Low Oil ShutdownNo
Ignition SystemElectronic
Governor SystemMechanical
CarburetorFloat
Throttle ControlRemote
Choke ControlChoke-A-Matic
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

Additional Information

Engine Specs

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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
Extended Warranty Repair Plan
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Extended Warranty + Accidental Damage Repair Plan
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Briggs & Stratton Powerbuilt Vertical Replacement OHV Engine with Electric Start — 500cc, 1in. Dia. x 3 5/32in.L Shaft, Model# 31C707-3026-G5 The price is $529.99.
Briggs & Stratton Powerbuilt Vertical Replacement OHV Engine with Electric Start — 500cc, 1in. Dia. x 3 5/32in.L Shaft, Model# 31C707-3026-G5
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Item# 24921
In Stock Online
Only $529.99
(9)
Item# 42552
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Only $529.99
(46)
Item# 70421
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Was $579.99
Sale $549.99
(24)
Item# 701753
Factory Shipped —
Estimated Delivery: 6 - 11 Business Days
Only $899.99
(1)
Item# 70181
Factory Shipped —
Estimated Delivery: 6 - 11 Business Days
Only $1299.99
Hide Similarities
Engine Displacement (cc)
500 500 540 500 570
Start Type
Electric Electric Electric Electric Electric
Application Riding mower, lawn tractor Riding mower, lawn tractor, trail mower Riding mower, lawn tractor Riding mower, lawn tractor Commercial mower, lawn tractor
Engine Type OHV Intek Intek–OHV Intek–OHV Vanguard V-Twin OHV
Rated Power (HP)
17 1/2 - - 17.5 18
Shaft Output
Vertical Vertical Vertical Vertical Vertical
Crankshaft Tapped 7/16-20, Keyway, 1 in. dia. 1 x 3 5/32 Tapped 7/16–20, keyway, 1 in. dia. - -
Shaft Diameter (in.) 1 3 5/32 1 1 1
Shaft Length (in.) 3 5/32 1 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) Counterclockwise CCW 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 Cast iron Cast iron Cast iron
Bore x Stroke (in.)
3.56 x 3.06 3.56 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 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 Tank Capacity (qt.) 17 - - - -
Fuel Pump
No Yes Yes, Pulse Yes, (Pulse) Yes
Fuel Filter Yes Yes Yes - -
Oil Capacity (qt.)
1 1/2 1 1/2 1.5 (48 oz.) 1.5 (48 oz.) 1.5 (48 oz.)
Lubrication System
Splash Splash 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 Choke-A-Matic Manual Manual - -
Max. RPM
3,300 3,300 3,300 3,300 3,300
Charging System Amps 9 9 9 9 16
Muffler Included
Yes Yes Yes Yes No
Flywheel Brake No 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 x 13 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