1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 276Get this manual
CHAPTER EIGHT
WARNING When performing Step 2b, do not start the drill until the cable is inserted into the pipeAt no time should the drill be running when the cable is free of the pipeThe whipping action of the cable could cause serious injuryWear heavy shop gloves and aface shield when using this equipment
bFind several large ball bearings or nuts that will just fit into the expansion chamber or mufflerCount the bearings or nuts as they are inserted, then shake the pipe violently to break loose carbon that is inside3Shake the large pieces out into trash containerEXHAUST SYSTEM REPAIR