The QuickStop chain brake is tripped via the front hand guard or by inertia if a sufficiently strong kickback is registered.  This brings the chain to a standstill within a fraction of a second.

 

 

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QuickStop chain brake

STIHL easy start system

                          

MS390 - Robust Mid-Range Saw

All machine functions, such as cold start, operation and stop, are controlled by a single lever.  This makes the machines more convenient to operate because the right hand never leaves the handle.

Vibrations from the engine and circulating chain are considerably reduced in accuracy calculated buffer zones, thus allowing the operator to work more safely and without tiring.

STIHL anti-vibration system

 

The manual fuel pump, decompression valve and STIHL ElastoStart ensure comfortable, virtually jerk-free starting.

The chain is tensioned from the side, through the sprocket cover.  This makes it impossible to come into contact with the sharp chain.

Lateral chain tensioner