Stihl MS 171 Manual page 29

8. Engine
8.1 Muffler / Spark Arresting
Screen
Always check and, if necessary,
repair the fuel system, carburetor,
air filter and ignition system before
looking for faults on the engine.
– Troubleshooting, b 4
: Pry the plugs out of the muffler by
means of the tabs (arrows).
1
: Take out the screws (arrows).
– Remove the muffler (1), check
and replace if necessary.
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1
: Remove the heat shield (1).
Spark arresting screen
1
: Use suitable pliers to pull out the
spark arresting screen (1) (if
fitted).
– Clean the spark arresting screen
(1) and replace if necessary.
– Install in the reverse sequence.
: Inspect and clean the sealing
faces (arrows), b 16
– Position machine vertically.
1
: Place the heat shield (1) in
position and use the recesses
(arrows) to line it up on the
sealing face of the exhaust port.
1
– Care place the muffler (1) in
position.
: Fit the screws (arrows) and check
correct position of heat shield
again.
– Tighten down the screws
(arrows) firmly.
: Push home the plugs (arrows).
– Tightening torques, b 3.5
MS 171, MS 181, MS 211