That one goes to the hole in the factory air filter (environmental) or just to free air. Same with the crankcase breather on the head. DO NOT tie them together, you can pressurize the crankcase and blow seals. I ran both of mine to the air filter, I just added a second hole in the oem style air filter. I think it looks more factory that way, the carb breathers going thru the carb side covers and the crank breather hose over the top tucked up in the frame.
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