Stihl FS 90 Product Instruction Manual - Page 30
MIX Engine - 4 stroke
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English Removing the metal cutting attachment N Block the drive shaft. N Unscrew the mounting nut clockwise. N Take the parts off the shaft - do not remove the thrust plate (7). 4-MIX Engine The STIHL 4-MIX engine features mixture lubrication and must be run on a fuel mixture of gasoline and engine oil. It operates otherwise on the 4-stroke principle. N Place the cutting attachment (6) on the thrust plate (7). Collar (see arrow) must engage the mowing head's mounting hole. N Fit the thrust washer (8) and rider plate (9) on the shaft (10). N Block the drive shaft. N Use the combination wrench (12) to screw the mounting nut (11) on to the output shaft counterclockwise and tighten it down firmly. If the mounting nut turns too freely, fit a new one. 28 FS 90, FS 90 R