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Erratic idling behaviour, poor
acceleration
Idle speed setting is too lean (e.g. at low
ambient temperature).
:
Turn the low speed adjusting
screw (L) approx. 1/4 turn
anticlockwise until the engine runs
and accelerates smoothly
Idle speed cannot be increased
sufficiently via the idle speed
adjusting screw (LA), engine stops
when changing from part-load to idle
speed
:
Turn the low speed adjusting
screw (L) approx. 1/4 turn clockwise
until the engine runs and
accelerates smoothly
38
Correcting the carburetor setting for
use at high altitudes
The setting may have to be marginally
corrected if the engine performance is
unsatisfactory at high altitudes.
:
Check the standard setting.
:
Let the engine warm up.
:
Set idle speed correctly.
:
Turn the high speed adjusting
screw (H) clockwise (leaner)
The screws should only be adjusted
carefully and as little as possible. The
slightest adjustment produces a tangible
difference in engine behaviour.
If the setting is too lean, there is a
risk of a shortage of lubricant and
overheating – resulting in damage
to the engine.
Spark arresting screen* in
the muffler
2
1
If engine performance deteriorates,
check the spark arresting screen in the
muffler.
Wait until engine has cooled
completely before performing the
following operations.
:
Remove the screw (1)
:
Pull the spark arresting screen (2)
upwards out of the muffler
:
Clean the soiled spark arresting
screen
:
If the screen is damaged or heavily
carbonized, fit a new one
:
Refit the spark arresting screen in
reverse order of steps
*
According to version
TS 410, TS 420
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