© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
13. Spark Plug Appearance
Heavy
carbon build-
up and oil
fouled
Mix ratio
incorrect.
Black, sooty
appearance
Caused by
rich fuel/air
mixture
Normal color,
normal electrode
wear due to high
run time
Normal color and
wear
Carbon buildup
due to high run
time
Both of these
plugs have served
their useful life
© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
14. Muffler
Remove the 2 muffler nuts and
deflector plate and inspect the
spark arrester screen
It must be present for all hand
held engines used in the United
States
The screen may be blocked
with carbon deposits
If necessary shine a light
through the screen to verify
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