Chainsaw engines run at high temperatures, usually in the summer, so they can quickly overheat. To prevent chainsaws from overheating they must be cleaned regularly. The cylinder and starter both contain air intake areas that pull cool outside air into the engine when it's running. If dust, wood chips or other material blocks these systems, the engine will start to overheat. The engine also needs to expel hot air, so the muffler must also be kept clean to keep the engine from overheating.
Brush off the cover on the starter side, where the starter rope comes out. Wipe off all sawdust and oil with the rag. Unscrew the starter cover with the screwdriver. Lift the starter cover off the cooling system of the chainsaw.
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Hold the chainsaw by the front handle so the starter side is tilted downwards slightly. Brush off the entire starting, flywheel and cooling area, letting the sawdust fall away from the engine. Wipe off any remaining sawdust with the rag.
Unscrew the cylinder cover on top of the engine. Brush out the fins on the cylinder carefully. Brush off both sides of the cylinder cover. Wipe the cover and cylinder with the rag.
Unscrew the muffler cover with the screwdriver. Pull out the spark arrestor screen and brush it off. Clean the inside of the muffler and the exhaust port with the rag and brush. If heavy black carbon deposits are stuck inside the muffler, replace the entire muffler to prevent overheating.