To start a Stihl weed eater, follow these steps:

1. Check the fuel tank to ensure it has the correct fuel mixture (usually a mix of mid-grade gasoline and two-cycle engine oil or STIHL's premixed MotoMix).
2. Turn the power switch to the "On" position.
3. Press the fuel bulb (primer) five times to prime the engine by delivering fuel to the carburetor.
4. Set the choke lever to the full choke (cold start) position if the engine is cold. If it’s warm, set the choke halfway or to the run position.
5. Hold the weed eater firmly with one hand on the handle and the other on the pull cord. Pull the rope briskly until the engine tries to start (usually takes 2 to 5 pulls).
6. Once the engine tries to start, switch the choke to the "Run" position and pull the rope again until the engine runs smoothly.

These steps ensure a smooth start for your Stihl weed eater and prevent flooding or stalling.