Question about Motorcycles
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: Bleeding Air from Cooling System
With the system cold, fill the radiator with a 50/50 antifreeze and water mixture - fill it all the way to the top, then put the cap back on. Now, fill the plastic overflow bottle about 1/2 way with your antifreeze solution.
Ride the bike until normal operating temperature is achieved (or longer, if you like). Now park it and let it cool down again. Then, check the coolant level in the overflow bottle and add more antifreeze, if needed.
When you operated the engine until normal operating temperature was achieved, all air trapped in the cooling system gets pushed out by the expanding coolant (out through the overflow bottle and into the atmosphere). Then, during the subsequent cool-down period, only liquid is drawn back into the radiator from the overflow bottle as the engine coolant cools and contracts, not air. From this point, as long as the radiator cap is not removed - and the overflow bottle is maintained at the 'full' level, no air will enter the system.
Posted on Dec 04, 2009
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