Husqvarna SMR 630 Owner's Manual page 231

SPARK ARRESTER (USA)
The SMR/USA muffler is equipped with a "Spark arrester" approved by the U.S. Forest Service. This muffler improves both the performance and the
efficiency.
" SPARK ARRESTER" MAINTENANCE AND CLEANOUT INSTRUCTIONS
Proceed as follows:
A: Remove the screws (1) and the L.H. side panel (2).
B: Remove the two screws (4) fastening the muffler to the rear frame. Remove the spring fixing the muffler to the exhaust pipes (front inside area of
the muffler). Extract the silencer from the union manifold to the exhaust pipe.
Note*: If silencer or exhaust are difficult to remove, help to slide them apart by tapping gently with a rubber or plastic hammer.
C: remove the rivets (5), the clamps and the endcaps (3) and (6) from silencer's body;
D: examinate SPARK ARRESTER conditions and remove, if necessary, carbon particles from the SPARK ARRESTER screen;
E: if necessary, inflate air on the SPARK ARRESTER screen, in the opposite direction in respect of the exhausted gas flow;
F: assemble the front endcap on the silencer's body, mounting the screws in the correct position, providing a tight connection between endcap and si-
lencer's body, using, if necessary, a silicone paste;
G: re-assemble the silencer on motorbike.
Due to the SPARK ARRESTER position on the silencer, if you need only to check the SPARK ARRESTER conditions you can:
A: disassemble the silencer from motorbike;
B: check SPARK ARRESTER conditions simply looking into the silencer from front endcap opening;
C: if the check is positive, you can proceed in re-assembling the silencer on the motorbike;
D: if the check is negative, proceed with the maintenance and cleanout procedure.
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