Engineered to significantly improve safety and efficiency when cutting trees, grass and more.
Technological developments are resulting in ever cleaner, more effective and more fuel-efficient internal combustion engines. The chainsaw’s two-stroke engine is no exception. Having a clean and healthy working and local environment is important to everyone, including those who use chainsaws in their daily work. X-Torq
Engineered to significantly improve safety and efficiency when cutting trees, grass and more.
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Cut Dry. Cut Clean.

Technological developments are resulting in ever cleaner, more effective and more fuel-efficient internal combustion engines. The chainsaw’s two-stroke engine is no exception. Having a clean and healthy working and local environment is important to everyone, including those who use chainsaws in their daily work. X-Torq, which is Husqvarna’s new technology for two-stroke engines, reduces exhaust emissions by up to 75 % and lowers fuel consumption by up to 20 % compared to earlier engine generations.
 

Chain brake

The greatest hazard when working with a chainsaw is if the saw kicks back. Kickback can happen if something contacts the upper quadrant of the tip of the bar, or if you try to cut with that same quadrant (the “kickback sector”). The bar tip will then try to climb upwards, and the saw will be thrown backwards by the force of the rotating chain.

You should always make sure the bar tip does not contact anything, and never try to cut with the kickback sector of the bar.

Engine

The carburetor may need to be adjusted, i.e. when operating in high or low altitudes, or their fuel oil-to-gasoline ratios must be adjusted to run properly. Electronically controlled carburetors make all adjustments automatically. 

To ensure clean air supply to the carburetor, chainsaw producers offer different filters with fine or less fine mesh. In clean surrounding air a less fine filter can be used, in dusty environment the other.

Drive mechanism

Typically a centrifugal clutch and sprocket. The centrifugal clutch expands with increasing speed, engaging a drum. On this drum sits either a fixed sprocket or an exchangeable one. The clutch has three jobs: When the engine runs idle (typically 2500-2700 rpm) the chain does not move. When the clutch is engaged and the chain stops in the wood or another reason, it protects the engine. Most importantly, it protects the operator in case of a kickback. Here the chain brake stops the drum and the clutch releases immediately.