+ Add to My products ? Free Stihl FS 90 manuals! Problems with Stihl FS 90? Our system has returned the following pages from the Stihl FS 90 data we have on fileslib. GENUINE STIHL FS 90 SERVICE MANUAL - ORIGINAL (NOT A REPRINT) STIHL FS 90 TRIMMER OWNERS MANUAL GOOD OEM STIHL KM 90 KM-90 TRIMMER BRUSHCUTTER OWNER OPERATOR FS models may be used as either a trimmer or a brushcutter – therefore, the power tool is referred in this manual as a. "trimmer / brushcutter.
How do you adjust the carburetor on a Stihl FS 90? Start the trimmer and hold the throttle trigger in all the way to get the trimmer head spinning at maximum speed. Turn the H screw clockwise with a carburetor adjustment tool until the head is spinning as fast as it will go, then back off the screw carefully until the RPMs start to decrease .
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