Why Is My Chainsaw Starting Difficult After Winter?

Fuel Stagnation and Moisture

Old fuel in your chainsaw can cause difficult starting, as it becomes less volatile and harder to ignite. If you haven’t changed the fuel in your chainsaw during the off-season, it’s likely that the fuel has degraded, leading to poor engine performance. To address this, drain the old fuel from the engine and fuel tank, and fill it with fresh fuel that’s been treated with a fuel stabilizer. Use a ratio of 1-2 ounces of fuel stabilizer per gallon of fuel. For example, if you’re using a 5-gallon fuel tank, add 5-10 ounces of fuel stabilizer.

Carburetor and Air Intake Cleaning

Corrosion from moisture buildup in the carburetor and air intake can also cause starting difficulties. To clean these components, disassemble the air filter, intake manifold, and carburetor bowl. Use a mixture of 50/50 water and white vinegar to soak the parts, then scrub them with a soft-bristled brush to remove any corrosion. Dry the parts thoroughly before reassembling the carburetor and air intake. Use a carburetor cleaner or a small amount of carburetor cleaner spray to remove any remaining corrosion or debris.

Cylinder Cleaning and Spark Plug Replacement

Moisture buildup in the cylinder can also cause starting difficulties. To clean the cylinder, use a cylinder cleaning kit or a piston ring cleaning tool to remove any corrosion or debris. Check the spark plug and replace it if it’s fouled or worn. Use a spark plug gap gauge to set the spark plug gap to the manufacturer’s recommended setting, typically 0.025-0.030 inches.