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Briggs & Stratton

Briggs and Stratton Vertical 17.5 HP 500cc INTEK Engine 9amp 1" x 3-5/32" #31R977-0054

    • Based on 255 reviews
Condition: New
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$708.14 Why this price?
Save $217.13 was $925.27

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Availability: In Stock.
Fulfilled by Small Engine Warehouse
Arrives Tuesday, Apr 15
Order within 18 hours and 43 minutes
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Features

  • Cast iron cylinder sleeve and dual element air filter for extended engine life
  • Patented linear balancing system provides smoother performance
  • 9 amp/electric start only
  • 1" x 3-5/32" shaft, tapped 7/16" with 1/4" keyway
  • Common riding mower replacement engine

Description

This genuine 500cc Briggs & Stratton single cylinder engine offers dependable power for your equipment needs. With a power rating of 17.5 horsepower, this engine features a premium Dual Clean air filtration system, electric starter, and maintenance-free Magnetron electronic ignition. With a manufacturer limited warranty of 2 years consumer use / 1 year commercial use, Briggs & Stratton provides power that you can trust. This engine includes a Dura-Bore cast iron cylinder sleeve for extended life. This engine includes a fuel pump. This engine includes an oil filter. This engine includes a 9 amp charging system.

Product Dimensions: 19 x 4 x 4 inches


Item Weight: 0.01 ounces


Manufacturer: Briggs and Stratton


Is Discontinued By Manufacturer: No


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Apr 15

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews

    • Perfect Replacement For 16.5 HP DR Field and Brush Mower Engine
Review Image by Ancient Mariner Ancient Mariner
Review Image by Ancient Mariner Ancient Mariner
I needed to replace the 16.5 HP B&S motor on my DR ProXL30 brush mower, because the decompression mechanism no long worked and the starter could not overcome the compression. This 17.5 HP B&S motor is a perfect replacement. It comes with starter, electric fuel solenoid, alternator, and magneto, but it does not come with a muffler. Before disposing of the old motor, be sure to save the 3 self-tapping mounting bolts, the connectors from the old motor and the muffler parts. The motor comes with no instructions on mounting or wiring, but it is pretty straight forward. The 3 mounting bolts are self-tapping in the new aluminum motor frame; you do not need to tap the holes. The pulleys and electric clutch are held in place by a single shaft bolt and Woodruff keys, These are easily removed from old motor and fit perfectly on the shaft of the new motor. The new motor comes with 3 wires to be connected to the existing wire harness on the mower - a red for the alternator, gray for the fuel solenoid and black wire for the magneto - but it requires repurposing 3 old connectors (round single pin, flat 2 pin and square 6 pin connector). Basically you connect the gray to the gray, black to the black and red to red using the old connectors (ignore the orange wire) aided by wire quick-connects or wire nuts. After being fueled, the motor started immediately when ignition key was turned. I couldn't be happier with the new motor, but let us hope these new motors will not have the decompression starting problems that plagued the original motors. ... show more
Reviewed in the United States on October 4, 2024 by Ancient Mariner Ancient Mariner
    • Perfect Fit
I ordered this engine for my 2011 model Troy-bilt riding mower and was afraid that it wouldn't fit because the design of the new engine looked different. But everything fell into place and I fired it up. Ran like a champ, drove like a champ and now I might get another 14 years out of my mower.
Reviewed in the United States on January 3, 2025 by G'Dad
    • 100% new & original B&S engine
Engine was in immaculate brand-new condition. Packaging very sturdy & thankfully weather-resistant as it was delivered to the wrong address where it sat outside in the rain for a while. Engine & paperwork inside was nice & dry. No defects or faults noted, easily installed & runs like a champ. Would highly recommend this supplier if you are in need of a new engine to refurbish a 23-year-old riding mower. ... show more
Reviewed in the United States on November 10, 2024 by John R. Dodge
    • Great replacement for the Briggs and Stratton 31r907
After doing a ton of research I found this engine would fit in the same spot as my old 31r907. This model, the 31r977, featured some desirable upgrades like an oil filter and a fuel pump. It was easy to install in the same spot as my old engine. As others have said, do not despair about there not being threading in the mounting holes, your old bolts will make the threads for you. Just start the bolts and turn slowly with a socket wrench. There was some minor wiring I needed to do between the two. What I ended up doing was comparing the old harness to the new one. I de-pinned some of the connectors on the new harness and used the old harness clip to wire into the rest of the lawnmower. Take your time, make sure the wires from the new harness fit into the same spot the old wires did in the old clip, and it'll work perfectly. Something I didn't realize was the old crank bolt is on TIGHT. Be prepared to fight with a bit both getting it on and getting it off. On my 31r907 the torque spec was about 100ft-lbs. This engine does NOT come with oil, be sure to add engine oil before operation. There is a little bit of oil in the crank case probably just for testing. 5 stars, anyone with a bit of mechanical knowledge could swap one of these engines. Very easy as far as motors go. ... show more
Reviewed in the United States on May 30, 2024 by Amazon Customer
    • Do NOT tap mounting bolt holes. The mounting bolts make their own threads.
I've worked on Lawn tractors for many years. I'm 77. I like this engine. It repalced an old 19.5 with a bad cam which I will repair later. IF you use the right mounting bolts they make their OWN threads. Start them half way before putting the engine on the machine then when you tighten them the engine will be very secure. IF you cut threads in this soft metal your engine might get loose. IF this engine had the same old 6 pin wiring harness like the older ones had, I would have been running this today. There is NO wiring diagram in the manuel either.. IF they had included an updated wiring harnass that would be great. Break it in. Change oil the first time after about 10 hours. This engine came with fuel pump and gas lines. All I had did was hook my gas line to their Filter. Everything cost's a tad too much right now, I've paid less in the past for engines but I feel good about this purchase. The last Intec decompresson on cam lasted about two years before the starter would not crank the engine. I hope this cam decompression has no plastic parts.. I have small engines stacking up needing new cams. I'm hoping the decompression on this cam will last a long time like the old ones did. I loved the old briggs engines and I hope to fall in love with this one. I love the 1 cyclinger Briggs engines. They are so easy to work on. ... show more
Reviewed in the United States on March 14, 2024 by Theysaid
    • Perfect fit. Crazy fast shipping
I ordered it on a Thursday afternoon and it was delivered Saturday before noon. I replaced a 15HP Intec from 2005 on an Ariens Zero turn 1540. Other than having to splice in 2 wires so I could use my old plug everything lined up perfectly with no modifications at all. Perfect match for Model 31H777 type 0110E1. I had left a voice mail after hours but had found out someone else had used it on my mower. Someone called me first thing in the morning but I had already ordered I was really impressed. Runs great and is much quieter than the old one. ... show more
Reviewed in the United States on August 30, 2024 by dcbtree
    • Replacement engine
My engine blew up on my craftsman riding mower and I ordered this engine to replace the factory one. The install only took an hour or less and it started right up on the first try. I am very happy with this product and would recommend it for anyone who needs to replace an engine. The cost is just a fraction of what a new mower would cost. ... show more
Reviewed in the United States on July 20, 2024 by Jim Cartlidge
    • It’s a Briggs
Great replacement motor for lawnmower it bolted in good but I had to redo the exhaust and wiring wasn’t bad at all just watch before you purchase this motor is single phase only
Reviewed in the United States on January 23, 2025 by Amazon Customer

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