2. It's vital that the gaskets are in good working order, because if they're not each time the piston goes up to draw an air fuel mixture it can also draw in air if there's any damage around the gasket. Wash the air filter in soapy water until the air filter comes completely clean. Problems with the ignition system will often cause the engine to misfire and hesitate under load. Left unchecked, overheating related to friction can stall a chainsaw or damage it. I put money into an electric log Splitter and Electric saws (All donated andimpressive for the need) all to be used at home. myimages[3]="../../../images/top-banner/LX25-FreeShipping.jpg" The Fix: Replace the air filter. //-->,