How full does the recovery tank need to be?
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The recovery tank (if we talk about the one of the coolant system in the front fender) works on suction.
If the cooling system heats up and expands, coolant is pushed into this tank, then later, if the engine coos down, coolant is sucked back through the pipe into this tank.
As there is some space between the bottom of the tank and the pipe, not everything can be sucked back (presuming the first time the tank was empty - hence your question).
So if you go from scratch, add an 1/2 inch of coolant into it, or watch your coolant levels very carefully the first couple of rides, and fill up where needed.
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Jhartz (09-08-2017)