Briggs & Stratton Crankshaft Replacement on a John Deere JS25 (Step-by-Step)

A hard impact can do more damage than you might think! In this video, I replace a bent crankshaft in a Briggs & Stratton engine on a John Deere JS25 self-propelled walk-behind mower after the mower struck an object and damaged the crankshaft. I walk through the entire repair process step-by-step, including engine teardown, crankshaft removal, installation of the replacement crankshaft, reassembly, and final testing to get this mower back up and running smoothly. Whether you're troubleshooting excessive vibration, a bent blade shaft, or major engine damage after hitting an obstacle, this video will show you what's involved in replacing a crankshaft on a Briggs & Stratton mower engine. In This Video: Diagnosing the damage Engine disassembly Crankshaft removal New crankshaft installation Engine reassembly Final startup and testing If this video helps you out, consider liking the video and subscribing for more small engine and commercial mower repair content.