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Need help figuring out a part

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There is a clear looking gasket on the left side of the bike right above the chain. What is this? does it need any fluids? because mine looks like there was some type of liquid that was evaporated. But I can't figure out what it is.

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There is a clear looking gasket on the left side of the bike right above the chain. What is this? does it need any fluids? because mine looks like there was some type of liquid that was evaporated. But I can't figure out what it is.

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Im talking about the clear thing that is located in the "v" looking thing that the frame makes. Thanks for the help. Screen Shot 2013-05-15 at 10.48.15 AM.pngScreen Shot 2013-05-15 at 10.48.02 AM.png

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It's the expansion tank for the radiator. When the coolant gets hot it expands and runs into the tank so it isn't lost on the ground. After shutting off the motor and it begins cooling off the radiator draws the coolant out of the tank and back into the radiator. I like to have an inch or so of coolant in the expansion tank when it's cool so I can tell quickly if the coolant level in the radiator is correct.

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