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Join Date: Nov 2007
Location: Chandler, Arizona
Yep, it's the coolant overflow reservoir, just like cars have. When the engine gets hot, the radiator cap opens and lest coolant into this tank. When the engine cools down again, a vacuum is created in the cooling system which again opens the radiator cap and lest the coolant back in. If you just bought the bike, you might want to change the coolant completely, and flush out the system with distilled water.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike