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I think it's just the hose routing internally that leads up to the actual hole on the lower crankcase. The volume of the crankcase under the pistons is what changes, so that internal tubing leads to the hole where the external tubing hooks up to your airbox, so that the crankcase fumes can be sucked in to the intake and burned off.

It's the same on just about every bike, just plumbed a bit differently on others. Crankcase vent lines also tend to get dirty and carbon-y in my experience, as do the PAIR valve plates. Worth a good cleaning once in a ever. Hope this helps.

-Mike
 
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