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
1122 140 0604 Muffler MS650
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
1128 140 0603 Muffler MS460
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
1137 140 0600 Muffler MS192
4201 140 0607 Muffler TS350, TS360
4205 140 0602 Muffler 050, 051, TS510, TS760
4221 140 0600 Muffler TS460
4223 140 0601 Muffler TS400
4224 140 0605 Muffler TS700, TS800
4238 140 0610 Muffler TS410, TS420
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.