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BRIGGS & STRATTON Professional Series 25 hp Vertical Gasoline Engine - Briggs & Stratton Engines
BRIGGSBriggs & Stratton Engines

BRIGGS & STRATTON Professional Series 25 hp Vertical Gasoline Engine

The BRIGGS & STRATTON Professional Series™ Gasoline Engine (MPN 44S977-0033-G1) is a 25 hp vertical-shaft engine with an electric start. It features a 1-1/8 in shaft diameter and a tapped 7/16"-20 shaft end.

SKU 3G-OTH-417284

Also listed as: 44S9770033G1 · 44S977 0033 G1

Brand
BRIGGS
Item
& STRATTON Professional Series 25 hp Vertical Gasoline Engine
Part Number
44S977-0033-G1
Category
Briggs & Stratton Engines
Available to Order
Also known as:44S977-0033-G1BRIGGS
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

BRIGGS
Manufacturer Part Number
44S977-0033-G1
Type
Vertical, 1 1/8 in
Horsepower
25 hp

Technical Documents

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BRIGGS Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The BRIGGS & STRATTON Professional Series™ Gasoline Engine (MPN 44S977-0033-G1) is a 25 hp vertical-shaft engine with an electric start. It features a 1-1/8 in shaft diameter and a tapped 7/16"-20 shaft end.

Frequently Asked Questions

What is the BRIGGS & STRATTON 44S977-0033-G1 engine used for?

This 25 hp vertical-shaft gasoline engine is designed for heavy-duty commercial lawn and turf equipment, such as zero-turn mowers and riding tractors. Its Professional Series™ build provides reliable power for demanding grounds maintenance applications.

What are the specifications of the BRIGGS & STRATTON 44S977-0033-G1?

This engine delivers 25 hp with a vertical shaft of 1-1/8 in diameter, tapped 7/16"-20 at the end. It features an electric start and is part of the Professional Series™. The manufacturer part number is 44S977-0033-G1.

Where to buy the BRIGGS & STRATTON 44S977-0033-G1 worldwide?

3G Electric supplies this BRIGGS & STRATTON Professional Series™ engine worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and a quote.

How to install a BRIGGS & STRATTON vertical engine?

Ensure the mounting surface is clean and the shaft aligns with the equipment's pulley or coupling. Use the tapped 7/16"-20 shaft end for secure attachment. Follow the engine manual for torque specs and break-in procedures. Always disconnect the battery before installation.

Used in

Common applications for BRIGGS
Pressure washers — Horizontal-shaft engines such as SKU 875GY4 (6.5 hp, 3/4 in shaft) and SKU 55EP70 (9.5 lb-ft torque, 5/8 in threaded shaft).
Portable generators — Horizontal-shaft engines like SKU 12V818 (5.5 lb-ft torque, 3/4 in keyed shaft) for recoil-start generator sets.
Riding lawn mowers — Vertical-shaft engines such as SKU 1WVK4 (17.5 hp, 1 in keyed/tapped shaft) and SKU 875GY0 (11.5 hp, 1 in shaft).
Zero-turn mowers — Vertical-shaft engines including SKU 875GX9 (19 hp, 1 in drilled/tapped shaft) and SKU 875GY2 (10 lb-ft torque, 25 mm shaft).
Commercial turf equipment — Vertical-shaft engines like SKU 875GY2 (10 lb-ft torque, 25 mm shaft) for mowers and aerators.
Construction equipment — Horizontal-shaft engines such as SKU 35ZD41 (13.5 hp, 1 in keyed shaft) for compactors and concrete mixers.
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BRIGGS Products

3G Electric supplies BRIGGS briggs & stratton engines. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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