Briggs & Stratton 8P502-0163-F1 4.5 GT 125cc Vertical Shaft Engine

The Briggs & Stratton 8P502-0163-F1 is a 4.5 GT, 125cc OHV vertical shaft small engine designed for reliable performance in walk-behind lawn mowers and other outdoor power equipment applications. With a recoil start system and fixed-speed governor, this engine delivers consistent, dependable power for residential use.

Key Specifications:

• Displacement: 125cc
• Crankshaft: 7/8" x 2-7/16" vertical shaft
• Keyway: 3/16"
• Drilled & Tapped: 3/8"-24
• Maximum RPM: 3,100
• Oil Capacity: 15 oz
• Start System: Recoil
• Shaft Orientation: Vertical

Engine Features:

• OHV (overhead valve) design for improved fuel efficiency and cooler operation
• Fixed-speed throttle control for consistent power output
• Lo-Tone muffler with stamped guard for quieter operation
• Primer bulb for easy cold-weather starting
• Positive stop compliance for added safety

The Briggs & Stratton 8P502-0163-F1 is sold as a complete engine packed in a single carton, ready for installation. It is a direct replacement engine suitable for a wide range of walk-behind mower platforms. Note: Engine mounting hardware is not included; reuse existing mounting hardware or source appropriate self-tapping bolts for new installations.