Chain saw

A chain saw having a body containing:

• an internal combustion engine chamber:
• a carburetor chamber formed adjacent to said internal combustion engine chamber;
• an air intake space formed on the side of said body;
• a first wall portion separating said internal combustion engine chamber and said carburetor chamber which comprises a first double wall defining a heat insulation space which communicates said air intake space with said carburetor chamber;
• a second wall portion formed integrally with said first wall portion on a side of the first wall portion opposite to said internal combustion engine chamber, said second wall portion comprising a second double wall which defines a communication passage which communicates said air intake space with said carburetor chamber;
• a first shutter provided between said air intake space and said heat insulation space, said first shutter adapted to selectively cut off communication so that air cannot pass between said air intake space and said heat insulation space but must pass directly through said communication passage when ambient temperature is warm and a second shutter provided between said air intake space and said communication passage adapted to selectively cut off communication so that air cannot pass between said air intake space and said communication passage but must pass through said heat insulating space when ambient temperature is cold.