Stihl HS 87, Instruction Manual

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► Check the air filter and clean or replace if nec‐
essary.
► Inspect cutting blades and clean if necessary
(clean, move freely, not warped).
8.3 Adjusting Idle Speed
Engine stops while idling
► Warm up the engine for about 3 minutes.
► Turn the idle speed screw (LA) slowly clock‐
wise until the engine runs smoothly – the cut‐
ting blades must not move.
Cutting blades run when engine is idling
► Turn the idle speed screw (LA) counterclock‐
wise until the cutting blades stop moving and
then turn the screw about another 1/2 to 3/4
turn in the same direction.
WARNING
If the cutting blades continue to run while the
engine is idling, have your power tool checked
and repaired by your servicing dealer.
9 Spark Plug
► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
► Fit a new spark plug after about 100 operating
hours – or sooner if the electrodes are badly
eroded. Install only suppressed spark plugs of
the type approved by STIHL – see "Specifica‐
tions".
9.1 Removing the Spark Plug
0023BA025 KN
► Pull off the spark plug boot.
► Unscrew the spark plug.
9.2 Checking the Spark Plug
000BA039 KN
A
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
sary – see "Specifications".
► Rectify the problems which have caused foul‐
ing of the spark plug.
Possible causes are:
–
Too much oil in fuel mix.
–
Dirty air filter.
–
Unfavorable running conditions.
1
000BA045 KN
WARNING
Arcing may occur if the adapter nut (1) is loose
or missing. Working in an easily combustible or
explosive atmosphere may cause a fire or an
explosion. This can result result in serious inju‐
ries or damage to property.
► Use resistor type spark plugs with a properly
tightened adapter nut.
9.3 Installing the spark plug
► Fit the spark plug by hand and screw it in
► Tighten spark plug with combination wrench
► Press the spark plug boot firmly onto the spark
plug
10 Lubricating the Gearbox
English 9 Spark Plug
14 0458-449-0121-C