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Model#: BGSN31C707-3026-G5

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Briggs & Stratton 31C707-3026-G5 500cc Power Built Series Engine with 1 in. Tapped 7/16 - 20 Keyway Crankshaft (CARB)

  • Briggs & Stratton 31C707-3026-G5 500cc Power Built Series Engine with 1 in. Tapped 7/16 - 20 Keyway Crankshaft (CARB)
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Briggs & Stratton's Power Built Series is a value-engineered yet highly functional group of engines. Designed to meet basic riding mower needs, the Power Built series features unique Overhead Valve (OHV) technology combined with a simple to maintain design to create a more durable, long lasting engine.
  • Advanced debris management with dual-sealing cartridge style air filter provides the maximum protection to extend engine life
  • AVS anti-vibration system provides linear balancing to eliminate side motion to reduce vibration and smoothen operation
  • Dura-Bore cast iron cylinder sleeve withstands more wear and abuse while providing improved oil control
  • DuraLube splash lubrication system offers a gear driven system that continuously supplies oil to all internal parts
  • Heavy-duty Teflon coated bronze sleeve bearing withstands twice the belt load of standard bearings to reduce wear
  • Magnetron electronic ignition delivers quick and dependable stars with no maintenance required
  • Overhead Valve (OHV) design runs cooler and cleaner to deliver more power, longer life and improved fuel economy
  • Model Specific Features: Choke-A-Matic choke, 12V Gear Drive starter with 9 amp DC alternator and dipstick oil system
  • Please Note: Fuel tank omitted from this model
  • 500cc Power Built Series Engine w/ 1 in. Tapped 7/16-20 Keyway Crankshaft - 31C707-3026-G5


Series: Power Built
Length: 18.9 in.
Width: 15.5 in.
Height: 12.9 in.
Carburetor: Float-Feed
Controls: Remote
Cooling System: Air
Crankshaft Diameter: 1 in.
Crankshaft Length (Sump Face to Crankshaft End): 3-5/32 in.
Crankshaft Model Number: 697127
Crankshaft Tapping Size: 7/16-in - 20
Crankshaft Type: Keyway
Cylinder Bore: 3.56-in (90.5mm)
Cylinder Stroke Length: 3.06-in (77.6mm)
Engine Configuration: Vertical
Engine Displacement: 500cc
Engine Technology: OHV
Fuel Type: Gas
Governor: Mechanical
Governor Max. Speed (RPM): 3,300
Horsepower: 17.5
Lubrication System: Splash
Number of Cylinders: 1
Oil Capacity: 48 oz.
Power Type: Gas
Recommended Use: Lawn Mowers, Riding Mowers, Tow-Behind Mowers
Shipping Weight: 77.6 lbs.
Starter: Recoil



5.0 / 5.0
1 Review
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Would you recommend?
Yes (1)
Easy To Use (1)
Yes, I would recommend this to a friend
Easy To Use
started right up
works great
March 29, 2014

Questions & Answers

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Browse 4 questions Browse 4 questions and 5 answers
I need to chamge my engine 31G777 0120/E1/0208147A which would mower this model compatible
Emilio on Aug 19, 2016
BEST ANSWER: Your question would be best answered by Briggs & Stratton directly. For assistance, please call 800-683-8484
Does this engine include the pulse fuel pump?
Joel on Aug 25, 2013
BEST ANSWER: No this engine does not include a pulse fuel pump.
wires on carb for choke or fuel shut off? will this engine run on propane?
Tony on May 24, 2013
BEST ANSWER: This engine will not operate on propane.
I have a B&S 31P707 engine I'm looking to replace on my lawn mower. What models are compatible?
Joshua on Oct 6, 2012
BEST ANSWER: The 31P707 Series comes in many different variations. You should call Briggs & Stratton direct at 1-800-444-7774 for further assistance and ensure a compatible fit.