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• Always make sure that all nuts and bolts are firmly tightened and make sure the machine is
in good working order.
• Keep the machine in good condition, if necessary change warning and instruction labels on
the machine.
• Always ensure that the ventilation openings are kept clear of debris.
• For safety reasons, replace worn or damaged parts. Only use original spare parts and
accessories. Parts not tested and approved by the equipment manufacturer can cause
unforeseeable damage.
• Repair and maintenance work other than described in this section, which are more
complicated, or it needs special tools, let it on our authorized service.
• Always use gloves when performing maintenance and handling the chain.
REPLACING/CLEANING THE SPARK PLUG
If the chainsaw cannot be started and you have eliminated all other causes of failure, there is
probably a faulty or clogged spark plug that needs to be replaced or cleaned.
Always replace the spark plug with only the same or equivalent type. Faulty spark plug is not
covered by warranty.
Procedure:
1. Unscrew and remove the filter cover nut or loosen the latches of its attachment.
2. Remove the filter cover (if necessary, remove the filter).
3. Remove the spark plug wire from the spark plug.
4. Loosen the spark plug (counterclockwise) using the larger eye of accessory double-ended
wrench.
5. Remove the spark plug.
6. Clean and adjust the electrode gap using a gauge (fig. 13) or replace it.
7. Install the plug into the cylinder using your fingers and check that it is properly placed in
the thread.
8. Tighten the spark plug in a clockwise direction using the double-ended wrench.
9. Connect the spark plug wire back and make sure it is in its place.
10. Put the filter and the filter cover back and fix it.
CARBURETTOR ADJUSTMENT
• The carburettor in your machine was adjusted in production, but it may require a fine
adjustment. Especially after a running-in. Changing the setting is only possible if the engine
needs to be adapted to other operating conditions (altitude, weather, other petrol and oil
mixtures, etc.).
• The carburettor adjustment is only possible to a limited extent so that the engine runs
correctly, safely and, at the same time, meets the requirements of Directive 2016/1628/EU.
Note: I
It is strongly recommended to entrust the carburettor adjustment to an authorized
service centre. Incorrect and improper adjustment without a tachometer may result in
damage to the engine that is not covered by the warranty.
• The idle revolutions are set by the T screw
• Low (L) and high (H) revolutions are set using L and H nozzles. The ratio of the fuel/air mixture
is set with these nozzles, so do not change the setting unless absolutely necessary!
Rotate the nozzles clockwise to deprive the fuel mixture, thus increasing the revolutions.
HECHT_925_R_MANUAL_2022_EN.indd 30HECHT_925_R_MANUAL_2022_EN.indd 30 28.03.2023 11:58:0328.03.2023 11:58:03
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