Briggs & Stratton 33S877 EX1900 Durable Series

Reliable Riding Mower Re-Power Machines

This month’s spotlight engine series is a popular repower choice when it comes to professional riding mowers, and it comes from a brand we know and trust. Briggs & Stratton is a leader in the industry of replacement small engines, and EX1900 Series motors are as dependable as they come. Read on to learn what makes the 33S877 engines one of our customers’ most popular picks.

Engine Specs

EX Series engines offer commercial-grade power - the proof is in the numbers. Let’s get into the nitty gritty and cover the core specifications.

Key Features

33S877 EX1900 Durable Series engines offer more power and enhanced features, providing superior performance for your riding mower. Below, we cover what makes these engines stand out.

Full Pressure Lubrication: Premium oil and fuel filters increase the engine’s life and provide extended maintenance intervals for less down-time and more grass cutting.

Advanced Debris Management: Large, dual seal, cartridge-style air filters offer maximum protection for a longer engine life by deflecting and ejecting debris and clippings.

AVS (Anti-Vibration System): Provides a smoother ride for maximum operator comfort and minimal engine wear.

Super-Finished Crank Pin Bearing: Reduces friction and heat to minimize wear under heavy loads for an extended engine life.

Mechanical Governor: Reliably regulates engine’s RPM efficiently and keeps speed within safe limits.

Remote Stop: Allows for immediate shutdown of engine when safety is a concern

Real-World Applications

Many Briggs & Stratton small engines commonly power lawncare equipment. EX1900 Durable Series engines are made specifically for riding mowers. Some subcategories of riding mowers that 33S877 engines commonly repower are:

Zero Turn Mowers

Lawn Tractors

Tow-Behind Mowers

Brush Mowers

Stand-On Mowers

Our knowledgeable technicians and customer service representatives have recommended this engine as a replacement to repower riding lawncare equipment made by a range of well-known manufacturers, including the following:

Allis Chalmers

Bad Boy

Country Clipper

Craftsman

Dixie Chopper

Exmark

Gravely

Husqvarna

Hustler

John Deere

Kubota

Massey Ferguson

New Holland

Scag

Simplicity

Swisher

Toro

Troy-Bilt

And more!

New Year, New Series

Briggs & Stratton 33S877 engine models replace the older 33R877 models that were branded as Intek Series engines. Around 2016, Briggs & Stratton introduced the EXi Series, specifically for use on residential-use push mowers. The new EXi series engines featured user-friendly characteristics like the ReadyStart system for easy starting, tool-free access to key components for simple maintenance and “Just Check & Add” technology that allowed users to simply add oil without having to change out the old oil.

Over the following years, Briggs & Stratton enhanced other engine lines, including our spotlight riding mower engine. The old 33R877 Intek engine was eventually replaced with the 33S877 Professional Series engine. A little further down the road, Briggs tweaked the branding and features, which brings us to our current version of the engine:  the EX1900 Durable Series. 

With all that being said, engine designs are constantly being improved upon as new technology becomes available. Another replacement series is already on the way. In Briggs & Stratton’s 2025 engine catalog, the 5210PX series is called out for engine model numbers beginning with 33S8. That doesn’t necessarily mean that our specific spotlight engine will be branded under the new 5210PX Series right away, but we can assume that new, enhanced engines will eventually replace the current ones.

Will a Briggs & Stratton EX1900 Durable engine work for you?

Briggs & Stratton designed the EX1900 Durable engines with a specific purpose in mind, and that is to power professional riding mowers and lawn tractors. While this Briggs engine series is a popular choice amongst our customers, it’s important to note that these engines aren’t necessarily the right choice for your piece of equipment.

The best possible way to determine which replacement engine is right for you is by referencing your current engine’s unique identifying numbers. On a Briggs & Stratton engine, you’ll need to find the model and type number. Check out our guide on how to find this information. Need some additional help? That’s what our experienced support team is here for! Give us a call or send a message and we’ll help you determine what engine will work for your unique application.

Engine Comparison

At Equipatron, we offer two different 33S877 EX1900 Durable Series engines. Most of the specifications are the same, but there are a couple of key differences that are important to note when determining which engine will work best for your unique application. Keep scrolling to compare our available EX1900 Durable Series engines.