Stihl TS 420 STIHL Cutquik174 Product Instruction Manual - Page 40

Spark Arresting Screen in, Muffler

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English Abrasive wheel runs when idling N Turn the idle speed screw (LA) counterclockwise until the abrasive wheel stops running - then turn another full turn in the same direction WARNING If the abrasive wheel continues to keep rotating in idle even after adjustment, have the cut-off machine checked by a servicing dealer. Speed erratic when idling; poor acceleration (despite adjustment to LA setting) The idle setting is too lean. N Turn the low speed adjusting screw (L) approx. 1/4 turn counterclockwise until the engine runs and accelerates smoothly - max. up to the stop Idle speed cannot be increased sufficiently via the idle speed adjusting screw (LA), engine stops when changing from part-load to idle speed The idle setting is too rich. N Turn low speed adjusting screw (L) approx. 1/4 turn clockwise. Whenever the low speed adjusting screw (L) has been adjusted, it is usually also necessary to readjust the idle speed adjusting screw (LA). Correcting the carburetor setting for use at high altitudes The setting may have to be marginally corrected if engine performance is unsatisfactory at high altitudes: N Make standard setting N Let the engine warm up N Turn the high speed adjusting screw (H) slightly clockwise (leaner) - max. up to the stop NOTICE After descending from a high altitude, restore the carburetor setting to the standard setting. If you make the setting too lean it will increase the risk of engine damage through lack of lubrication and overheating. Spark Arresting Screen in Muffler In some countries, the mufflers are fitted with a spark arresting screen. N If engine performance deteriorates, check the spark arresting screen in the muffler WARNING Wait until engine has cooled completely before performing the following operations. 2 1 N Remove screw (1) N Pull the spark arresting screen (2) upwards out of the muffler N Clean the soiled spark arresting screen N If the screen is damaged or heavily carbonized, fit a new one N Refit the spark arresting screen in reverse order of steps 370BA031 KN 38 TS 410, TS 420

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TS 410, TS 420
English
38
Abrasive wheel runs when idling
N
Turn the idle speed screw (LA)
counterclockwise until the abrasive
wheel stops running – then turn
another full turn in the same
direction
WARNING
If the abrasive wheel continues to keep
rotating in idle even after adjustment,
have the cut-off machine checked by a
servicing dealer.
Speed erratic when idling; poor
acceleration (despite adjustment to LA
setting)
The idle setting is too lean.
N
Turn the low speed adjusting
screw (L) approx. 1/4 turn
counterclockwise until the engine
runs and accelerates smoothly –
max. up to the stop
Idle speed cannot be increased
sufficiently via the idle speed adjusting
screw (LA), engine stops when
changing from part-load to idle speed
The idle setting is too rich.
N
Turn low speed adjusting screw (L)
approx. 1/4 turn clockwise.
Whenever the low speed adjusting
screw
(L) has been adjusted, it is usually
also necessary to readjust the idle
speed adjusting screw (LA).
Correcting the carburetor setting for use
at high altitudes
The setting may have to be marginally
corrected if engine performance is
unsatisfactory at high altitudes:
N
Make standard setting
N
Let the engine warm up
N
Turn the high speed adjusting
screw
(H) slightly clockwise (leaner)
– max. up to the stop
NOTICE
After descending from a high altitude,
restore the carburetor setting to the
standard setting.
If you make the setting too lean it will
increase the risk of engine damage
through lack of lubrication and
overheating.
In some countries, the mufflers are fitted
with a spark arresting screen.
N
If engine performance deteriorates,
check the spark arresting screen in
the muffler
WARNING
Wait until engine has cooled completely
before performing the following
operations.
N
Remove screw (1)
N
Pull the spark arresting screen (2)
upwards out of the muffler
N
Clean the soiled spark arresting
screen
N
If the screen is damaged or heavily
carbonized, fit a new one
N
Refit the spark arresting screen in
reverse order of steps
Spark Arresting Screen in
Muffler
2
370BA031 KN
1