Stihl does not recommend owner service of all silencer types on its weed trimmer and skirmish trimmer machine . Some models admit emission control devices housed within the damper and should not require service unless deformed or damage . Stihl recommends replacement by a qualified technician rather than menage repair . Other fashion model without emanation control mufflers may include discharge arrestor screens that can be remove and clean or replaced by owners . control operator ’s manual of arms for specific sustainment suggestions for your auto .
Step 1
Make certain the kindling switch is in the the off office . Let the machine chill wholly before serve the muffler . damper contain internal alloy parts that delay hot long after the muffler housing cools . Thirty minutes of cool - down should be plenty . Test by holding a helping hand near the top of the engine but do not relate . Wait until no heating system radiates from the simple machine .
Step 2
Locate three mounting screws that hold the engine shroud or top cover version in place . Find the first screw in a embrasure slightly above and to the right side of the starter rope handle ; the other two screws are on the paired destruction of the motor , one on each side of the upper engine cover version .
Step 3
Use a screwdriver to remove the three screws completely and lift aside the motor shroud . Clear away any obvious dust from the top of the locomotive engine and muffler .
Step 4
Find the spark arrestor screen at the exhaust port of the silencer . In most Stihl two - cycle engines , a exclusive screw holds the screen in shoes . scrutinize the screen for carbon buildup that reduce exhaust menses and for holes that could allow burning cloth pass . If the concealment is clear and intact , supersede the motor cover .
Step 5
fair or replace spark arrestor screen that are clogged with carbon paper or damaged . Remove the single retention screw propeller . raise and pull the spark apprehend screen out of the silencer . Brush carefully with a brass telegram brush to loosen carbon . Carbon repository in the muffler itself point problems with the fuel mix . Scoop out any severe buildup with the screwdriver tip .
Step 6
sloping trough cleaned or new screens into place over the muffler exhaust port and secure with the memory piece of tail . supersede the engine cover and reinstall the cover screws .
Tip
oil colour in or on the damper is n’t strange and will burn off during normal mathematical process .
Warning
Dented or deformed mufflers should be replaced by a restricted serving technician .
