Stihl MS 172C E 16" Chainsaw unleashedusb Quick Release Coupling 28511 Quick Release Coupling or other floor coverings IntelliCarb™ Compensating Carburetor The IntelliCarb™ Compensating Carburetor is designed to automatically adjust the air fuel ratio when the air filter becomes restricted or partially clogged and maintains the engine’s correct rpm IntelliCarb™ uses air from the clean side of the air filter to control the diaphragm and flow of fuel As the air filter becomes dirty and less air is available for the carburetor The MS 172 C E chainsaw comes equipped with a 16 in Light 01 guide bar and a side access chain tensioner which allows you to conveniently adjust your chain with a bar wrench