© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
16. Inspect Exhaust Port and Piston
With the muffler removed use
a flashlight and look through
the exhaust port to be sure
the port is not clogged up
with carbon deposits
Move the piston up and down
and inspect the surface of the
piston skirt for scoring or
damage
A piston in good condition
will still have the radial
machine marks across the
skirt indicating little or no
wear
© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
16. Inspect Exhaust Port and Piston
Spray some lubricant on
the rings and when the
flywheel is turned back
and forth slightly it will be
apparent if the rings are
free in the lands
Lower the piston to BDC
Inspect the intake side of
the cylinder wall for wear
or damage
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