Stihl FS 90 R Product Instruction Manual - Page 30

MIX Engine - fuel mix

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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

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FS 90, FS 90 R
English
28
N
Place the cutting attachment (6) on
the thrust plate (7).
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.
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
).
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.
Collar (see arrow) must engage
the mowing head's mounting hole.
If the mounting nut turns too
freely, fit a new one.
4-MIX Engine