21SR 430, SR 450
: Pull the wiring harness (1) out of 
the guide (arrow).
– Remove the carburetor, b 9.5
– Remove the container,
SR 430 b 10.1, 
SR 450 b 10.2
– Remove the metering unit, 
SR 450, b 10.3
– Remove the blower wheel, 
b 10.6
: Take out the screws (arrows).
: Push the complete engine (1) out 
of the blower housing.
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1
– Check the engine and, if 
necessary, replace the cylinder, 
piston, crankshaft or crankcase 
– the muffler, ignition module and 
spacer flange must be remove for 
this purpose.
– Inspect the oil seals and replace 
if necessary, b 4.3
– Check correct position of the oil 
seals 
– they must be properly located 
in their seats.
Installing
Take care to avoid pinching the 
short circuit and ground wires 
between the engine and blower 
housing.
: Push the straight crankshaft 
stub (1) into the blower housing 
bore (arrow).
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1
– Push the engine against the 
blower housing.
– Position the engine against the 
blower housing and hold it there 
– line up the holes in the engine 
and blower housing.
: Insert the screws (arrows) and 
tighten them down firmly.
– Install the blower wheel, b 10.6
– Fit the blower housing, 
SR 430 b 10.7, 
SR 450 b 10.8
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