I know this is an older trimmer/brushcutter but it has had little use. I am going to use it with a four blade brushcutter head and adjusted the RPM as guided by the owners manual to about 10,000 rpm using a tach. It smokes heavily, more so than with the autocut string head adjusted as guided by the owners manual. The rpm following the autocut head procedure is about 15,000 to 16,000. Is the heavy smoke a problem or to be expected with the high speed screw turned in to control the speed? Idle speed, by the way, is about 5,000 rpm. The low end should be around 2800 to 3000 rpms, the high end max should be 9,700 to 11,300 max blade or trimmer head.What is your fuel mixture?

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It should be 50:1 for all stihl products, using a part or full synthetic mix oil, with the premium fuel as recommended by stihl.your screw setting should be 1 to 1.25 turns for both the high and low speed adjustments to start with then tune from there. I just looked and I can not find any stihl trimmer that they recommend to be set at 15,000 to 16,000 rpms. The highest I find is 13,000 and that is for the fs 550 56 cc brushcutter the biggest unit they make. I just double checked the fs 76 service manual and its 2700 low end rpms,9700 to 11,00 high end rpms and 1 turn each on the high and low and tune from there.

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At some point during the life of your Stihl trimmer or brush cutter, it may be necessary to change the trimmer head. If the head wears out, breaks or becomes unbalanced, it will need replaced with a new head. Some Stihl trimmer models may also be fitted with alternate cutting heads, including metal blades or brush knifes for heavy grass cutting or different types of string heads for varying types of light grass cutting. You do not need to remove the line from the trimmer in order to replace the head.