DadCrashed-
Although I haven't yet seen much deep water here in Mississippi, I did the same as GlennP, just a habit with me. Plus, as I understand it from the magazines this will also help prevent bogging in whoop sections as it prevents the fuel from frothing up.
I actually have now gone a step further and installed filtered, one way vents and a vent on the crancase breather as well (routed up to the backbaone). I purchased mine from
http://www.kevinscycleracing.com/advert.html#page4 Look for the Deep Water section at the top of the last page on the web site. They are really into enduro type stuff; very good people to deal with.
Good Luck,
Joe
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Joe Hammond
Meridian, MS
'97 KTM 250 EXC, '85 XL-600
AMA, Blue Ribbon Coalition, NETRA, SERA (soon)