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You should retrace that hose. Nothing attached to the airbox is part of the cooling system. The cooling system is full of coolant and operates under pressure. No hose that went to the airbox would hold pressure. Instead, it would spew coolant all over the place. There are two hoses that go into the back of the air box. One is part of the PAIR valve system and one is the crankcase breather hose. It is reasonably common for people who have removed the pair valve system but not done so fully to block off the pair valve hose with a bolt. I suspect and hope that the hose you see with the bolt is part of the pair valve system. The larger hose that goes into the airbox is the crankcase breather hose and must NOT be blocked as this can lead to pressure build up in the crankcase and a blowout of the shifter seal. To test this, shut the bike off, remove the dipstick, place a small piece of tissue paper over the dipstick hole. Then blow into the large hose that enters the air box., If this hose is the crankcase breather hose, the air will come out the dipstick hole and the tissue will be displaced by the air.

If you determine that the crankcase breather hose is truly blocked off, remove this bolt immediately and reconnect the hose to the proper place on the back of the air box.
 
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