Solo USA 129HS - Manual (Page 13)

Operating and maintenance instructions
ENGLISH 13
Before opening the air filter, close the choke to
prevent dirt entering the carburettor.
Turn air filter lid (22) clockwise (viewed onto the air
filter lid), and remove the lid. Remove foam filter
(27) from the lid and clean the area around the
filter.
Clean the foam filter daily, if the equipment is used
all day. Clean more frequently, if you are working
under very dusty conditions. Simply knocking the
filter casing or blowing dust from the filter bowl are
the best methods of daily maintenance. Immediately
replace the foam filter, if it shows any sign of
damage. Engine failure due to incorrect
maintenance and care are excluded from our
warranty.
Insert the new or cleaned foam filter into the air
filter lid. Position the lid onto the filter casing,
guided by the guide spigot, and lock into place with
an anti-clockwise rotation.
Never insert moist or wet foam filters!
8.4 Carburettor adjustment
The carburettor has been adjusted optimally at the
factory. Subject to the operational altitude
(mountains or low lying areas), the carburettor may
require readjustment.
If the idle speed is correctly adjusted, the engine
should run without moving the blade. Slight
adjustments of the idle throttle into the average
idle speed given in the specification can be made via
the idle stop screw "T" by following the instructions
below (the use of a tachometer is recommended):
The air filter must be clean to ensure correct idle
speed adjustment. Let the engine run until it is
warm, before making any adjustments.
• If the engine idles too fast (in particular if the
power tool has already operated at idle speed),
turn the idle speed stop screw "T" anti-
clockwise.
• If the engine idles too slowly (i.e. the engine
always dies in idle), turn the idle speed stop
screw "T" clockwise a little, until the engine
runs smoothly.
Under no circumstances must the cutter be
driven at idle speed!
Only qualified mechanics must adjust the
regulating screws for idle mixture "L" and full
load mixture "H".
If the idling speed cannot be set correctly with the
idling end-stop screw "T", request an authorised
service centre to tune the carburettor.
The following instructions are for authorised
service shops
D-CUT carburettors:
Use the D-CUT carburettor key to adjust the idle
mixture screw "L" and the full load mixture screw
"H". Check with our customer service team
regarding the basic setting.
Carburettors with limiter caps:
The regulating screws for idle mixture and full load
mixture can only be adjusted in a limited range.
The carburettor is tuned for optimum engine
performance. Use a rev counter to tune the
carburettor correctly!
Do not adjust the engine to a higher speed.
Excessive engine speed can lead to major engine
damage!
8.5 Information about the spark plug
Check the spark plug regularly after 50 hours of
operation.
• Press the spark plug cover (26) together at the top
and bottom, and move it away from the engine
casing by pushing it back.
• Disconnect the spark plug cap.
• Unscrew the spark plug and dry the electrodes.
The spark plug should be replaced after 100 hours
of operation or if the electrodes are badly worn.
Do not turn the engine over while the spark plug
has been removed or the spark plug cap has been
Fig. 18
Fig. 19