[juliusmichaelhonrada]

Originally Posted by Motofool

Do not worry, if the cooling system is half dry, the head of the engine will get damaged very soon, which was not your case.

The overflow tank is just a reserve of liquid to compensate for dilatation and contraction of the liquid contained in the closed and pressurized loop.

The leak through that orifice comes from the suction side of the pump, which sees the lowest pressure; however, the cap of the radiator is sealing properly and that low pressure is higher than atmospheric pressure; hence, the leak after the engine is hot.

The total amount of liquid that the closed loop contains is around 1.0 liter.
Keep on refilling the expansion tank and happily riding.

Please, learn how the cooling system works:
http://faq.ninja250.org/wiki/Cooling_system

http://faq.ninja250.org/wiki/How_do_...ling_system%3F

Thank you again motofool , how come i dont have a button to rate your post helpful