Husqvarna 450E, 18 in. 50.2cc 2-Cycle Gas Chainsaw X-TORQ - Delivers lower fuel consumption and reduced exhaust emission levels in accordance with the worlds most stringent environmental regulations SMART START - The engine and starter have been designed so the machine starts quickly with minimum effort AIR INJECTION - Centrifugal air cleaning system removes larger dust and debris particles before reaching the air filter. This results in reduced air filter cleanings and improved engine life QUICK-RELEASE AIR FILTER - Facilitates cleaning and replacement of the air filter TOOL LESS CHAIN TENSIONING - Quick and easy chain tensioning and assembling of the bar and the chain without using any tools Choose a smaller chainsaw that is easier to maneuver if youre new to chainsaw work A heavy chainsaw for beginners can be too heavy, making your arms and hands quickly tire, which can represent a safety risk Wood types and size of trees will also impact your chainsaw choice Choose a larger chainsaw with more power if you want to fell larger trees or hardwood A chainsaw if too small will be subjected to great strain and unnecessary wear Guide bar size is determined by tree size and to some extent by the level of your expertise Experienced users should have access to at least two different guide bar lengths Guide bar length should vary with different tree sizes Shorter guide bars weighs less and are easier to maneuver when removing tree limbs Longer guide bars are used for felling larger trees Professional chainsaws provide maximum performance and optimal ergonomics All-round chainsaws are built in the same way as pro-saws, but with a slightly lower performance Consumer saws are small, easy-to-use and designed for home use by people who dont use their chainsaws very often Tree care saws are designed specifically for professional arborists in tree care work Delivers lower fuel consumption Reduces exhaust emission levels In accordance with the worlds most stringent environmental regulations Centrifugal Air Cleaning System Removes Larger Dust And Debris Particles From Reaching Air Filter Reduces Air Filter Cleanings And Improves Engine Life System design reduces vibration levels Lessens operator fatigue Combined start/stop switch Smart start and fuel pump make the saw very easy to start