Some say it is used as a hole to mount a jig when the cases are built. May be true, I don't know. It also is drilled upwards at an angle into the ignition/flywheel housing and acts as a drain for errant moisture. They aren't meant to be plugged.
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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!)
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