Maybe it doesn't matter, just seemed odd.
Are you putting the end cap thing back on after you remove the spark arrestor, or just leaving it off?
Edit: It looks like, according to the doc, it is called a spark arrestor ring, so I assume it should be left off when the spark arrestor is removed. But, it seems like it would look odd, almost unfinished, without the ring.
Here's a pic of what I mean: (page 6 - http://www.yoshimura...pdf/2257714.pdf) I know the link is for a Honda unit, but the spark arrestor assembly is the same.
Edited by jcm3, September 06, 2011 - 07:19 PM.