Missing Hose?

I recently bought a 2001 Yamaha WR426.

I was looking at some pictures online and noticed my bike doesn't have the black hose that runs from the tank to the bottom of the frame past the bash plate. Does anyone know what this hose is for. I have attached a photo below of a bike with the hose.

Screenshot 2015-05-16 at 8.44.32 PM.png

That is the crankcase or top end vent hose.

Thanks, where exactly does it start so I can trace it back and see if it has been rerouted or something?

Thanks, where exactly does it start so I can trace it back and see if it has been rerouted or something?

 

Are you sure your picture is a WR. The YZ's had the direct vent from the top of the head to the ground. The WR's usually connected toward the air box.

 

So check the top valve cover under the gas tank. That's where the hose starts.

I had a look today and it has been rerouted to where all the carby hoses go. Thanks for your help.

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