© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
23. Vacuum Test Tank Vent
Reverse the tester into
vacuum mode and pump
hard and fast to see the
needle indicates that
some negative pressure
is present in the tank
Stop pumping and watch
the gauge and the
needle should move
back up towards zero
rapidly
If the needle does not
leak back to zero quickly
the tank vent must be
replaced and then re-test
© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
24. Inspect Intake Side Of Piston
With the carb removed
look through the inlet port
and rotate the crankshaft
to inspect the intake side
of the piston
The machine marks
should be present on a
piston in good condition
Scoring or a dull gray
appearance would
indicate lack of
lubrication, dirt ingestion,
or possibly other
problems that would
prevent the engine from
running properly
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