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2012+ WR450F coolant overflow... should there be some coolant in there?


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Just as the title states, on the 2012+ WR450's should there be some coolant in the overflow tank? I just bought a new 2014 WR450 and while the main radiator is full and topped off the overflow tank has nothing in it.

 

Thanks!

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Catch is for when coolant boils over and then can be sucked back onto radiator when motor cools. As long as rad is full and system is prime it should be good. Mine always carries just under half full in overflow when cold. Never had any overflow or Overcook problems.

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Just as the title states, on the 2012+ WR450's should there be some coolant in the overflow tank? I just bought a new 2014 WR450 and while the main radiator is full and topped off the overflow tank has nothing in it.

 

Thanks!

 

I'm pretty sure there is a fill line on the reservoir tank.  Fill it to that.  Mine always has coolant in it.

Edited by mch
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I keep an inch (about 2 ounces) in my bikes with the overflow tank. If the bike is cold and less than an inch of fluid is there, I know I am loosing coolant. Having some there ensures that my radiator is completely full and it keeps the line purged of air.

 

BTW, a dry engine cooling system will not take a whole quart of coolant.

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It should be empty

I disagree although it's not that a big deal.

I like to have some coolant in the overflow reservoir when the engine is cold. When coolant is visible you always know that the rad is completely full at a glance without having to open the rad cap.

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Mine always finds it's "happy spot" at about 1/3 of the catch can. As has already been said, I like to see it as I then am comfortable that my rads are full. Verified every few rides when the bike is cold and can open the rad cap.

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