37TS 400
English / USA
Setting idling speed
: It is usually necessary to change the 
setting of the idle speed adjusting 
screw (LA) after every correction to 
the low speed adjusting screw (L).
Engine stops at idle speed
: Set to standard setting
: Turn the idle speed adjusting screw 
(LA) clockwise until the abrasive 
wheel starts to run, then back off the 
screw one quarter of a turn.
Abrasive wheel runs on at idle speed
: Set to standard setting
: Turn the idle speed adjusting screw 
(LA) counterclockwise until the 
abrasive wheel stops running, then 
turn screw another quarter turn in 
the same direction.
Erratic idling behavior, 
poor acceleration
Idle setting is too lean (e.g. at cold 
ambient temp.):
: Turn the low speed adjusting 
screw (L) counterclockwise - until 
engine runs and accelerates 
smoothly.
The spark arresting screen in the muffler 
must be checked if the engine 
performance deteriorates.
: Remove the retaining clip (1) and 
spark arresting screen (2) with 
suitable pliers
: Clean the soiled spark arresting 
screen.
: The screen must be replaced if it 
is damaged or there is a severe 
build-up of carbon.
: Refit the spark arresting screen and 
retaining clip
* see "Guide to Using this Manual"
Wrong fuel mix (too much engine oil in 
the gasoline), a dirty air filter and 
unfavorable running conditions (mostly 
at part throttle etc.) affect the condition of 
the spark plug. These factors cause 
deposits to form on the insulator nose 
which may result in trouble in operation.
Spark arresting screen* 
in the muffler
38BA026
1
2
Checking the Spark Plug
000BA002 KN