Chainsaw won't start? Starts then stalls? Runs rough? Hesitates before accelerating? Blows black smoke? Or leaks gas from the air filter? If your Stihl chainsaw is suffering from these common engine issues, Hipa's ultimate all-in-one repair kits will solve all these problems. Join the 50,000+ others who have used Hipa to repair their Stihl chainsaws once and for all.
A: This Stihl chainsaw won't-start troubleshooting is oriented toward the MS 170, MS 180, MS 250, and MS 290 models, with diagnosis and remedy included. However, much of the maintenance guidelines apply to your other Stihl Chainsaw models and a wide range of chainsaw brands.
If your Stihl chainsaw won't start, the possible CAUSES may be:
Carburetor is overchoked, improperly adjusted, or needs replacement.
Air filter is dirty, or too damaged, it might be better to just replace it.
Spark plug is fouled, improperly gapped, or damaged. Make sure your spark plugs are tight, clean, and connected securely. We recommend changing the spark plug every season.
Oil filter or fuel line is clogged OTHER POSSIBLE CAUSES:
Fuel tank is empty or shutoff valve is closed, or fuel line or fuel tank cap vent is clogged. Old gas or water in the gas tank.
Ignition coil or its wiring is defective or ignition switch is off, or timing is way off (e.g., broken flywheel key).
A: Carburetor or fuel filter could be the problem. A clogged carburetor or fuel filter is often caused by leaving fuel in the chainsaw for a long time. As volatile ingredients in the fuel are gone, the fuel may become sticky and can clog up the carburetor and fuel filter and cause the engine to run roughly. If the carburetor is clogged, try cleaning it or replacing the entire carburetor.
Air filter may be clogged or dirty. If the air filter is dirty, the engine will get too much fuel and not enough air. As a result, the engine may stall or run roughly. Inspect the air filter to determine if it is clogged. If the air filter is clogged, replace it.
A: If your Stihl chainsaw keeps knocking, the first thing you want to check is the oil level, as low engine oil is one of the main causes of engine knocking. Check the air filter, and replace a new one if it's dirty or clogged. The engine not firing in sync is also a primary cause of your engine knocking, and this could be caused by a bad or misfiring spark plug.
A: Bad spark plug; the air filter is clogged, or the carburetor needs adjustment.
A: The possible causes are dirty carburetor, clogged air filter, blocked fuel filter, damaged gasket, oily buildup on a spark plug, or vent blocked.
A: The engine that is running too rich is the primary cause for black smoke being emitted from your Stihl chainsaw's exhaust. To prevent your chainsaw from blowing black smoke from the exhaust, replace the air filter regularly as a part of normal maintenance. Also, make sure that the carburetor gasket does not leak, or that the piston rings are not worn out.
A: The reason for that may be you're using the chainsaw at altitude or the carburetor adjustment has simply slipped. The chainsaw also won't operate well at speed if the air filter or spark arrestor or carburetor are dirty. The carburetor gasket leaks or its rings wear out.
A: The air filter becomes clogged or dirty; it will allow enough fuel to the engine to run on idle, but not enough to sustain full throttle.
A: The carburetor can become clogged, making it difficult for fuel and air to enter the engine.
A: The carburetor diaphragm or gasket may be broken; carburetor misadjusted; bad spark plug or ignition coil; air filter or fuel filter clogged; vent or fuel line blocked, or the chainsaw is out of fuel.
A: The carburetor may be stuck, damaged, or dirty.
A: It could be due to a blocked air filter. A plugged air filter will restrict airflow into the engine, reducing power and performance.
A: The carburetor is gummed, or the gasket is damaged. The spark plug is sooted, smeared with oil, or the air filter is dirty. A bad ground inside the module would also be a possible cause.
A: Most probably the carburetor issues: the carburetor is stuck, damaged, or dirty. Or fuel filter/gas cap/fuel line leaks.
A: The engine is getting too much or not enough fuel from the carburetor, and the carburetor needs adjustment or replacement."
A: The sealing ring or spring in the accelerator pump is worn or damaged, and a new carburetor replacement is needed.
A: It could be that the chainsaw chain is bent or damaged. Clean the dirt from your chainsaw's bar and chain, and use a thicker bar and chain oil. These will help reduce the friction between your chain and bar, making it run smoother.
What other problems did you encounter? Tell us and we'll help!