English / USA
Standard Setting
Adjusting Idle Speed
Fine Tuning for Operation at High
Altitude or at Sea Level
A slight correction of the setting may be
necessary if engine power is not
satisfactory when operating at high
altitude or at sea level:
L
H L
:
:
:
Check standard setting.
Warm up the engine.
Turn the high speed screw (H)
slightly clockwise (leaner) – on
models with limiter caps (H = 1/4),
no further than stop.
LA
:
:
Shut off the engine.
Engine stops while idling
Turn the high speed screw (H) and
low speed screw (L) counter-
clockwise as far as stop (max. 1/4
turn).
:
Carry out standard setting on the
low speed screw.
If the setting is too lean, there is a
risk of engine damage due to
insufficient lubrication and
overheating.
:
Turn idle speed screw (LA)
clockwise until the engine runs
smoothly.
Erratic idling behavior, poor
acceleration
:
Carry out standard setting on the
low speed screw.
:
Turn low speed screw (L)
counterclockwise until the engine
runs and accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
BR 340, BR 340 L, BR 420, BR 420 C
21
| Categories | Blower Vacuum and Sweeper Manuals, STIHL Blower and Vacuum Manuals |
|---|---|
| Tags | STIHL BR 340, STIHL BR 420 |
| Download File |
|
| Language | English, Español |
| Product Brand | STIHL. Stihl Inc, USA - Corporate phone: (757) 486-9100. International Support Information: http://stihl.com Email: info@stihl.com, Blower Vacuum |
| Document File Type | |
| Publisher | stihl.com |
| Wikipedia's Page | Stihl |
| Copyright | Attribution Non-commercial |
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