What Killed This Ryobi Chainsaw? (C4618 Autopsy)

This Ryobi C4618 chainsaw would run, but it never ran correctly. In this video I pressure test the engine, diagnose the air leaks, identify the failed seals, explain how the 2-stroke engine operates, and perform a complete teardown/autopsy to see what actually caused the failure. Unfortunately, the repair cost simply wasn’t worth it for this saw, so instead of rebuilding it, we tear it down and inspect every major component to understand why it failed. Links to products on Amazon: Seal puller https://amzn.to/3MnhIyv Ring compressor https://amzn.to/4jaiGKR Flywheel remover https://amzn.to/4iZvrYw PISTON STOP https://amzn.to/4aaoFg8 Vac pressure tester https://amzn.to/496d3K0 Full testing kit https://amzn.to/48NXhlJ (not the one I used but looks good) Rubber plugs https://amzn.to/4pUxtLu Heli coil kit https://amzn.to/48vMnSK Dirko red sealant: https://amzn.to/483ATns Vac and pressure tester: https://amzn.to/402mAhh Affiliate Disclaimer: This page contains affiliate links. If you purchase a product through one of them, I will receive a commission (at no cost additional to you). I only ever endorse products that I have personally used and benefited from. Thank you for your support! If you enjoy small engine diagnostics, chainsaw repair, pressure testing, and teardown videos, this one should be interesting. Tools and tests used: Pressure/vacuum testing Seal leak diagnosis Complete engine teardown Component inspection Failure analysis #chainsaw #ryobi #smallenginerepair #2stroke #diagnostics