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  • Briggs & Stratton 331877-3036-G5 540cc 21.0 Gross HP Intek Engine with 1-Inch X 3-5/32-Inch Length Crankshaft Tapped 7/16-20 (Discontinued by Manufacturer)
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Briggs & Stratton 331877-3036-G5 540cc 21.0 Gross HP Intek Engine with 1-Inch X 3-5/32-Inch Length Crankshaft Tapped 7/16-20 (Discontinued by Manufacturer)


Available from these sellers.
  • Cast iron cylinder sleeve and dual element air filter for extended engine life
  • Overhead valve design (OHV) for cooler operation and longer valve life
  • Float carburetor for consistent, easy starting
  • Pantented linear balancing system provides smoother performance
  • CARB Compliant
1 new from $680.34
This item’s packaging will be visible when delivered and cannot be gift-wrapped.

Product Description

This Briggs & Stratton 540cc 21.0 Gross Horsepower Briggs & Stratton Intek Engine with 1-Inch x 3-5/32-Inch Length Crankshaft, tapped 7/16-20 has 12 volt electric start, and a 9 amp DC alternator charging system. This engine also features a cast iron cylinder sleeve and dual element air cleaner for extended engine life along with a full pressure lubrication system that includes a premium oil filter. The patented linear balancing system provides smoother engine performance while the float carburetor provides for consistent easy starting. Cooler engine operation and longer valve life is obtained by the engine?s overhead valve design. The exhaust manifold and muffler are included but the fuel tank is omitted. For use on lawn tractors and is emission compliant for sale in all 50-states.

Product Details

  • Item Weight: 129 pounds
  • Shipping Weight: 129 pounds
  • ASIN: B005LTZXTI
  • Item model number: 331877-3036-G5
  • Average Customer Review: 5.0 out of 5 stars  See all reviews (6 customer reviews)
  • Amazon Best Sellers Rank: #346,387 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)
  • Product Warranty: For warranty information about this product, please click here


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Most Helpful Customer Reviews

3 of 3 people found the following review helpful By synopsoid1 on August 13, 2012
Verified Purchase
My lawn tractor after 10 years of reliable service finally died. The local outdoor power equipment places wanted my first born to replace the motor and recommended that I just buy a new tractor. After some searching on the Briggs & Stratton website I was able to determine that the bolt pattern and shaft dimensions of this motor matched those of my old one. So I ordered it up and when it came this is the process I followed for re-powering. I do realize that I replaced a 16 HP motor with a 21 HP motor but at the time the 16 HP motor was several hundred dollars more.Read more ›
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3 of 3 people found the following review helpful By memras on May 2, 2012
Verified Purchase
This engine replaced a failed B&S 14.5 HP IC engine on a Snapper LE14-5 38H Rider. The motor fit perfectly, but had to swap the anti-afterfire/stop switch connector from the old engine. The complete changeover took no more than 45 minutes, runs smoother and quieter than original engine, and no more laboring under load (with 6.5 extra hp and much more torque on tap). This engine was over $200 less than the B&S/Snapper suggested replacement and added the AVS features, along with pressurized oil filtration/spin-on filter, improved air filtration and many other improvements. It was delivered by Amazon/FedEx Freight in 2 business days. The B&S alternator replacement guide will easily assist anyone changing over from a different B&S and many competitor motors to this unit, if there are electrical differences - it can be currently found at: [...]).

Very Pleased with B&S and Amazon
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5 of 6 people found the following review helpful By stuff on December 26, 2011
Verified Purchase
I ordered this motor after the 19.5 hp engine on my John Deere LA 115 blew up. I was concerened that because it was not a direct replacement l might run into some issues. It was a direct fit. Even the wiring harness was the same. I did have to swap out my exhaust from the old engine. I also swapped the oil drain tube. Another person left a review regarding the bolt holes not being tapped. Again, not an issue as the bolts from the old engine are self taping. I had it swapped and running in less than an hour. It saved me at least a grand considering the cost of a new riding lawn mower and a couple of more hoursepower to boot. I couldn't be happier and highley recommend this motor. I also recieved free 2 day shipping as a prime member. I researched several other sites for a replacement motor and this deal from Amazon could not be beat.
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