Next, play with the high speed needle, but always back it out from the setting – about ¼ turn or so – from where it runs the smoothest. Keep playing with the low speed needle until you get a rapid, immediate response from the throttle and a good idle with the idle adjustment. Turn it back in midway between these two positions. Then, back this out until it starts to run rough or slows down. Next, hold the throttle wide open and slowly turn in the high speed, until it really starts to smooth out, rev high, and starts screaming. Slowly turn in the low speed jet, until it starts to die, then back it out another ¼ or ½ turn. You may have to keep the throttle open a bit, allowing the engine to keep running. Start the engine, allowing it to warm up for five minutes. One should be idle mix and the other high speed. To adjust the carburetor, start with both screws backed out two turns from the closed position. ![]() ![]() Check that the linkage is not bent out of shape, impacting operation of the carburetor. If the cable is stretched, replace it by disconnecting it at both ends and installing a new one. If the choke comes off too soon, it will cause the engine to die. The choke should be closed for start up and for the first few minutes, as the engine warms up. Take out the air cleaner housing and filter. Remove any covers necessary to gain access to the carburetor. Locate the carburetor underneath the air filter. If the settings become unadjusted, you will need to reset them in order to keep the engine running after it starts. We recommend using STIHL High-Performance Ultra 2-cycle engine oil for the best results with your gasoline-powered cut-off machine.Ĭlick the picture below to (download) a PDF version of the Best Practices for Mixing Fuel.The carburetor is designed to mix fuel and air in the proper mixture for combustion. This helps avoid issues of uneven mixtures and oil settling at the bottom of your saw. *Always use all of your remaining fuel in your saw before you refill again. Ensure proper mixing procedures based on your gas can's capacity.Use 89+ octane fuel with low or no ethanol added.Some additional tips to take notice of are: Attach the lid and shake the container by hand to ensure proper mixing of oil and gasoline.Fill 1-gallon container with gas to the 1-gallon line.To begin mixing fuel, here are some of the essential items you will need to start (For this example, we'll assume a 1-gallon container is used): There are three simple steps to follow when mixing fuel: All Stihl gasoline-powered equipment runs on a 50:1 mixture of gasoline and 2-cycle engine oil. ![]() Proper fuel usage can help avoid expensive repairs and unnecessarily damaged equipment. It is good practice to understand how to properly mix oil and gas in order to maintain your saw's performance over a long period of time. With proper usage of fuel and maintaining good saw practices, your saw won't be the only one happy, but so will you!ġ-gallon gas can, Synthetic 2-cycle engine oil, 89+ octane gas with no more than 10% ethanol, and Gloves. Not enough oil can lead to scoring on the piston and cylinder and cause damage to the saw's bearings. Too much oil can cause carbon build-up on your spark arrestor. This means understanding the proportions when mixing oil and gas together. If you want your saw to run longer, perform better, and function properly, it is critical to operate your saw with the proper fuel.
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