Stihl Mufflers


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The muffler on your Stihl chainsaw, cut off saw, trimmer or other equipment plays a number of important roles. First and most obvious is the reduction of sound from the engine. Second is to capture the extremely hot gases released through the cylinder exhaust port after combustion. These gases can not only cause serious burns, they can also start fires if exposed to saw dust or other combustibles. For this reason a seriously rusted or damaged muffler on any Stihl equipment should always be replaced. The third important role is in engine performance.

The muffler provides back pressure to the engine exhaust and as a result greatly affects performance by controlling the flow rate of exhaust gases. A common modification performed on Stihl chainsaws is called muffler porting. This involves drilling a hole, or holes, into the muffler to increase the exhaust gas flow rate. By some estimates modifying a Stihl chainsaw through muffler porting can increase power up to 20% however muffler porting can also reduce power if performed improperly. One rule of thumb suggests that the total hole size added to the muffler should never be greater than 80% of the size of the exhaust hole in the cylinder head. A spark arresting screen should also be fastened over to new hole because porting affects the mufflers ability to catch any pieces of hot carbon released through the exhaust. One common procedure is to weld a short length of pipe over the drilled hole in the muffler and than attach the screen to end of the pipe. The addition of the pipe also allows for further control of exhaust gas direction by placing a curve in the pipe. Before modifying a Stihl chainsaw by muffler porting one should also consider that this can void the manufacturer’s warranty.


1106 140 0502 Muffler  070, 090  

1108 140 0600 Muffler  08, 08S  

1110 140 0613 Muffler  040, 041  

1111 140 0610 Muffler  075, 076  

1113 140 0600 Muffler  030, 031  


1114 140 0607 Muffler  015, 020  


1117 140 0612 Muffler  042, 048  


1119 007 1027 Muffler  038, MS380  

1120 007 1009 Muffler  009, 010, 011, 012  

1121 140 0604 Muffler  024, 026, MS240, MS260  

1122 140 0602 Muffler  064, 066, MS640, MS660  



1123 140 0604 Muffler  021, 023, 025, MS210, MS230, MS250  

1124 140 0605 Muffler  084, 088, MS880  

1125 140 0607 Muffler  034, 036, MS340, MS360  

1127 140 0605 Muffler  029, 039, MS310, MS290, MS390  



1129 140 0601 Muffler  020, MS200  

1130 140 0600 Muffler  017, 018, MS170, MS180  

1132 140 0600 Muffler  019T, MS191T  

1133 140 0601 Muffler  MS270, MS280  

1135 140 0651 Muffler  MS341, MS361  



4201 140 0607 Muffler  TS350, TS360  

4205 140 0602 Muffler  050, 051, TS510, TS760  



4224 140 0605 Muffler  TS700, TS800  

4238 140 0610 Muffler  TS410, TS420




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