Condition Cause Remedy
Poor acceleration The chain is over-ten‐
sioned.
► Tension the chain properly.
Chain lubrication sys‐
tem is supplying
insufficient chain oil.
► Increase oil feed rate.
Engine does not
reach maximum
RPM.
Saw is not correctly
tuned to ambient con‐
ditions.
► Calibrate the saw.
Engine does not
reach maximum
power.
Spark arresting
screen in muffler is
dirty.
► Contact your STIHL servicing dealer for assistance.
Saw chain does not
rotate when throttle is
opened.
The chain brake is
engaged.
► Disengage the chain brake.
The chain is over-ten‐
sioned.
► Tension the chain properly.
Bar nose sprocket is
blocked.
► Clean the bar nose sprocket with STIHL resin solvent.
Smoke or burning
smell while cutting.
Chain is not properly
sharpened.
► Sharpen the chain properly.
Insufficient chain oil
in the tank.
► Fill up with chain oil.
Chain lubrication sys‐
tem is supplying
insufficient chain oil.
► Increase oil feed rate.
The chain is over-ten‐
sioned.
► Tension the chain properly.
Chainsaw is not
being used properly.
► Have correct use explained, then practice.
18.2 Adjust to standard setting
► Shut off the engine and engage the chain
brake.
► Turn the high speed screw H clockwise as far
as it will go.
► Turn the high speed screw H 1/2 of a turn
counterclockwise.
► Turn the low speed screw L clockwise as far
as it will go.
► Turn the low speed screw L 1/4 of a turn coun‐
terclockwise.
18.3 Adjusting Idle Speed
Engine stops while idling
► Carry out the standard setting.
► Start the engine and disengage the chain
brake.
► Warm up the engine by opening and closing
the throttle for about 1 minute.
► If the engine continues to stop while idling:
Turn the idle speed screw (LA) half a turn
clockwise and restart the engine.
► Turn the idle speed screw (LA) clockwise until
the chain begins to run.
► Turn the idle speed screw (LA) one full turn
counterclockwise.
18 Troubleshooting English
0458-890-8321-B. VA0.A21. 27
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