Description
Product Overview
The Briggs & Stratton 31L777-3136-G5 Vertical Engine is built for users who require dependable performance from their lawn mower or outdoor power equipment. As part of the Professional Series, this engine incorporates premium engineering features that improve durability, reduce maintenance, and extend engine life.
Powered by a 500cc single-cylinder gasoline engine, it delivers 17.5 gross horsepower, making it suitable for residential and commercial mowing applications. Its vertical shaft configuration allows direct compatibility with a wide range of walk-behind and riding lawn mowers designed for vertical crankshaft engines.
Advanced features such as full-pressure lubrication, oil and fuel filtration, chrome-plated valves, and advanced air filtration help protect internal engine components while maintaining reliable performance throughout the engine’s service life.
Key Features
The Briggs & Stratton 31L777-3136-G5 Vertical Engine combines proven reliability with premium construction.
Key Features
- 500cc Professional Series engine
- 17.5 Gross Horsepower
- Single-cylinder gasoline engine
- Vertical shaft configuration
- Electric start
- Full-pressure lubrication system
- Cast iron cylinder sleeve
- Fuel pump included
- Oil pump with filter
- Electronic ignition
- 9-amp charging system
- Heavy-duty flywheel
- CARB 50-State compliant
- Chrome-plated valves
- Advanced air filtration system
These features contribute to dependable performance, longer engine life, and reduced maintenance requirements.
Performance and Applications
The Briggs & Stratton 31L777-3136-G5 Vertical Engine is engineered for reliable operation in demanding lawn care environments.
Its 500cc displacement and 17.5 HP output provide the power required for mowing large lawns while maintaining smooth and efficient operation. The electric starter simplifies engine starting, while the 9-amp alternator supports charging requirements during operation.
Ideal applications include:
- Riding lawn mowers
- Garden tractors
- Residential lawn equipment
- Commercial mowing equipment
- Replacement engine projects
- Outdoor power equipment
Its 3300 RPM operating speed provides consistent cutting performance while maintaining fuel efficiency.
Design and Construction
The Briggs & Stratton 31L777-3136-G5 Vertical Engine is manufactured using durable materials designed for long-term reliability.
Its cast iron cylinder sleeve improves wear resistance, while the plain bearing design supports dependable operation under normal mowing conditions. The full-pressure lubrication system, combined with an oil filter, continuously protects internal engine components by maintaining proper lubrication.
Additional features such as chrome-plated valves, electronic ignition, advanced cartridge air filtration with pre-filter, and a heavy-duty flywheel contribute to smooth engine performance and extended service intervals.
The engine is also equipped with a fuel pump, making it suitable for applications where fuel delivery requires additional assistance.
Why Choose the Briggs & Stratton 31L777-3136-G5 Vertical Engine?
The Briggs & Stratton 31L777-3136-G5 Vertical Engine is designed to provide reliable power, easy maintenance, and long service life.
Benefits include:
- Professional Series durability
- 17.5 gross horsepower
- Reliable electric starting
- Full-pressure lubrication
- Cast iron cylinder sleeve
- Fuel and oil filtration
- Excellent replacement engine
- CARB 50-State compliant
- Easy compatibility with many lawn mowers
- Trusted Briggs & Stratton engineering
Ideal Applications
The Briggs & Stratton 31L777-3136-G5 Vertical Engine is recommended for:
- Homeowners
- Commercial landscapers
- Lawn care professionals
- Riding mower owners
- Garden tractor owners
- Outdoor power equipment repair shops
- Equipment refurbishment projects
- Replacement engine installations
It is an ideal choice for restoring reliable performance to compatible lawn mowing equipment.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | Briggs & Stratton |
| Model | 31L777-3136-G5 |
| Series | Professional Series |
| Engine Type | Single-Cylinder Gasoline |
| Displacement | 500cc |
| Gross Horsepower | 17.5 HP |
| Crankshaft Orientation | Vertical |
| Starter Type | 12V Electric Start |
| Fuel System | Gasoline |
| Fuel Pump | Yes |
| Oil Pump | Yes |
| Oil Filter | Yes |
| Air Cleaner | Cartridge with Pre-Filter |
| Cylinder Sleeve | Cast Iron |
| Ignition | Electronic |
| Carburetor | Float Type |
| Charging System | 9 Amp |
| Maximum RPM | 3300 |
| Crankshaft Size | 1″ × 3-5/32″ |
| Crankshaft Rotation | Counterclockwise (PTO Side) |
| Fuel Tank | Not Included |
| Warranty | 2-Year Consumer / 1-Year Commercial |
| Compliance | 50-State CARB Compliant |
Product Support and Purchasing Information
The Briggs & Stratton 31L777-3136-G5 Vertical Engine is supplied as a new Professional Series replacement engine ready for installation on compatible equipment. Before ordering, verify your engine model number, crankshaft dimensions, and equipment compatibility to ensure the correct fit. If you need assistance, our technical team can help confirm compatibility. You can also browse our collection of vertical shaft engines, Briggs & Stratton engines, lawn mower engines, and replacement small engines for additional options.
Frequently Asked Questions
Is this engine suitable for riding lawn mowers?
Yes. The Briggs & Stratton 31L777-3136-G5 is designed for compatible riding lawn mowers, garden tractors, and similar outdoor power equipment using a vertical shaft engine.
Does this engine include electric start?
Yes. It features a 12-volt electric starter for quick and reliable starting.
What makes the Professional Series different?
The Professional Series includes full-pressure lubrication, oil and fuel filtration, chrome-plated valves, and enhanced durability for longer engine life and reduced maintenance.
Is the fuel tank included?
No. This engine is supplied without a fuel tank, allowing compatibility with the equipment’s original fuel system.
Does this engine meet emissions regulations?
Yes. The engine is 50-State CARB compliant, making it suitable for use across all U.S. states where CARB compliance is required.
