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I believe it has been posted on here before. Still it's a good video.
 

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It's still all a mystery to me. I am amazed at how great it works and I'm amazed that it runs dry ... looks and sounds to me like there's a lot of friction and therefore ought to have lubricant. That cvt belt sure does a lot of work. Is there much tension on it?
 

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Is there a vent or breather that brings cooling air to the belt?
There is a cooling fan that draws outside air in through a filter and blows it across the belt before exhausting it out the top of the CVT. The filter is on the right side of the bike and draws air through the slots below the nose of the seat on the right hand side. You should be cleaning that filter when doing routine maintenance.
 

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Is there a vent or breather that brings cooling air to the belt?
A fan attached to the secondary pulley circulates air into through the serviceable filter and out a large opening on top of the CVT.

They are actually running that CVT in the video upside down. Starting at 0:35 (to 0:45) when the change views you can see the fan of the left side of the spinning secondary pulley and the air intake openings between the gaps in the orang painted parts on the left.
 
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