Adjusting The Carburetor - Stihl HS 87 Instruction Manual

English
Position filter cover against the left
N
side of the filter housing and swing it
to the right – the two lugs (arrows)
must engage the filter cover
openings.
Insert screw and tighten it down
N
firmly.
14

Adjusting the Carburetor

General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
Preparations
Shut off the engine.
N
Check the air filter and clean or
N
replace if necessary.
Inspect cutting blades and clean if
N
necessary (clean, move freely, not
warped).
Standard Setting
Turn high speed screw (H)
N
counterclockwise as far as stop (no
more than 3/4 turn).
Turn the low speed screw (L)
N
clockwise as far as stop, then turn it
back 3/4 turn.
Adjusting Idle Speed
Carry out the standard setting.
N
Start and warm up the engine.
N
Engine stops while idling
Turn the idle speed screw (LA)
N
clockwise until the cutting blades
begin to run – then back it off
1 1/2 turns.
Cutting blades run when engine is idling
Turn the idle speed screw (LA)
N
counterclockwise until the cutting
blades stop moving – then turn it
another 1 1/2 turns in the same
direction.
WARNING
If the cutting blades continue moving
when the engine is idling, have your
power tool checked and repaired by your
servicing dealer.
Erratic idling behavior, poor acceleration
(despite correction to setting of LA
screw).
Idle setting is too lean
HS 87 R, HS 87 T