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That's the crankcase vent hose. It provides crankcase ventilation by relieving pressure and scavenging fumes from the crankcase then recirculating them through the air filter. A 5/8" or 3/4" (depending on the ID of the original) heater hose should do in a pinch for a replacement but an OEM product seems readily available. The images above are for a 03-...

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