Description The STIHL Easy2Start system makes starting STIHL outdoor power tools almost effortless, eliminating the need for a strong pull of the starting cord. The quick chain adjuster allows the user to adjust the tension of the chain without the use of tools. Simply lift the lever and twist the caps to remove or tighten. 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 engineâs correct RPM. IntelliCarb uses air from the clean side of the air filter to control the diaphragm and flow of fuel. The air filter becomes dirty and less air is available for the carburetor, the IntelliCarb system adjusts the fuel flow to compensate for the decrease in air flow