If your chainsaw won’t start, don’t panic. In this video I walk you through the exact step-by-step diagnostic process I use to troubleshoot a professional two-stroke chainsaw in the field — no special tools required. Most chainsaw starting problems come down to three simple things: fuel, spark, and compression. I’ll show you how to isolate each one, how to check your spark plug and air filter, how to spot contaminated fuel, and how to clear a flooded engine so you can get back to work fast. This method works on nearly any two-stroke chainsaw, including Husqvarna, Stihl, Echo, and other professional saws. If your saw suddenly stopped running or refuses to start after storage, these checks will solve the majority of problems without a trip to the repair shop.