Stihl 4-Mix Engine Technology

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Outstanding Power & Performance

The STIHL 4-MIX® engine puts you in first place with exceptional power, unparalleled performance and high fuel efficiency. With the introduction of the STIHL 4-MIX® engine, STIHL unveils the outdoor power plant of the future. This patented engine design provides all the benefits of 2-stroke and 4-stroke technologies combined. The new STIHL 4-MIX® engine offers 5% more horsepower, 17% more torque and 15% less vibration than its 2-stroke counterpart.

Built with the patented STIHL lubrication system, it runs on standard 50:1 fuel-mix, thus eliminating the need for a separate oil chamber. Its compact design with fewer parts, creates less frequent service problems typical of a 4-stroke engine. And, its unique construction makes it weigh, only slightly more than its 2-stroke counterpart.

Professionals will appreciate the fast acceleration, lower noise, high torque and high fuel efficiency with fewer pit stops. So, when the day is done and the race is ended, finish in first place with the STIHL 4-MIX® engine.

Step 1 - Intake Stage/Stroke

Intake of fuel mix with upstroke of piston creates (vacuum) negative pressure in crankcase, drawing lubricating fuel mix into lower components of engine.

Step 2 - Compression Stage/Stroke

Fuel mix is compressed in combustion chamber and lubricating fuel mix continues to be circulated through crankcase.

Step 3 - Ignition Stage/Stroke

Fuel in combustion chamber is ignited. Piston begins downward stroke changing pressure in crankcase to positive, forcing lubricating fuel mix back to valve area for intake into combustion chamber on intake stroke.