If you're talking about the one without the plug it's a drain/vent for the flywheel/stator cavity. It is meant to be left open. The other one (with threaded plug) drains the crank case in case of a water drowning.
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jeff
'00 XC250 (mine)
LTS front and rear suspension, power valve cover, carb jet kit and rear chain glide, RB Designs head mod, BRP tall triple clamp, backyard foot-peg lowering conversion.
'04 EC250 (the kids)
(he can do his own mods haha!)
Last edited by jostby; 11-28-2010 at 06:23 PM.
Reason: a little more info added
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