What Does 'LA' Mean On A Stihl Chainsaw?

Stihl is considered one of the best chainsaw brands, known for its rugged performance and precision engineering, but if you've ever spotted a small "LA" marking near the carburetor, you might've wondered what it stands for. It's not a branding stamp or some model variation, but actually a very practical part of how your chainsaw runs. Tucked neatly beside other tuning screws, the LA screw plays a specific role that often goes unnoticed by casual users but makes a big difference in everyday performance.

Just like "MS" on your Stihl chainsaw means something important, the "LA" marking also makes a big difference. It stands for "leerlauf anschlag," which is German for "idle stop." It refers to the screw that controls your chainsaw's idle speed. While the L and H screws adjust the fuel mixture at low and high speeds, the LA screw is responsible for how smoothly your chainsaw idles when you're not actively cutting. Tweaking it even slightly can mean the difference between a smooth idle and a chain that spins dangerously on its own. Understanding how this small screw works gives you better control, both for performance and safety.

The LA screw is located on the carburetor, usually accessible through the side of the chainsaw housing. When the engine is idling, which means running but not cutting, this screw manages how much air and fuel the carburetor lets in. Turning it clockwise raises the idle speed, which can help keep the engine from stalling when you're waiting between cuts. On the other hand, turning it counterclockwise slows the idle, which is important for safety, especially if the chain starts moving when your hands are off the trigger.

Keeping your idle speed just right can be a lifesaver. A chain that spins at idle isn't just annoying, it's a hazard. It means the idle speed is too high and needs to be dialed back. But if your saw stalls the moment you let off the throttle, your idle is too low. The LA screw gives you control over this sweet spot, helping you run your chainsaw safely and smoothly. Since factors like altitude, attachments, and regular use can affect idle settings, occasional LA tuning is part of the regular maintenance of your chainsaw.

Before diving into adjustments, make sure your chainsaw is warmed up. Let it run for a few minutes so the engine reaches normal operating temperature. Also, check the air filter and spark arrestor, as clogs or buildup can throw off idle performance. Once that's done, fire up the chainsaw and adjust the LA screw in small turns. If the chain starts to move while idling, back the screw off slightly. If the engine sounds like it's about to stall, give it a small turn forward.

While the LA screw is fairly user-friendly, it's important to make only slight adjustments to avoid overcorrecting or causing unwanted chain movement. Over-tightening can cause excessive chain movement, which defeats the purpose entirely. If you've changed elevation recently — say, you're working up in the mountains – then you may also need to tweak the H screw slightly, as altitude affects fuel-air ratios. A balanced, properly adjusted carburetor helps your chainsaw perform at its best, and the LA (Leerlauf Anschlag) screw plays a key role in that equation.