Volume of coolant overflow tank & relocating

bernard said:

I need to relocate my overflow tank. My impression is that the tank is above the radiator so that the fluid can ebb & flow as you mentioned as pressure/vacuum with no air in line. To put it under the seat would leave air in the line to the radiator because it is not a sealed system. The tank has a rubber cap, not a seal. If the tank is lower than the radiator, coolant in the line would flow to the tank leaving air in the line preventing the return of the tank coolant. If I'm wrong, I'd like to better understand.

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speedfrk said:

Can anyone tell me the exact volume of the coolant overflow tank in ounces? I'm looking for options to replace my stock tank with pretty piece to go with my K&N tri-filter setup. Is there any problem temporarily relocating the overflow tank to where the air box assembly was? It seems as if the tank was there it would be lower than the radiator instead of higher. I think I've read here where folks have done this.

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Speedy said:

The tank can be below the radiator. The hose going to the radiator cap to the overflow tank once filled stays filled; like putting your finger over the end of a full soda straw. And both lines can run into the top of the tank; just run one all the way to the bottom and put a 45 degree cut on it so the hose doesn't suck flat to the bottom (doesn't work well that way). The other hose is a breather line and is left short so it stays above fluid level. Fill the tank near full and after the breather line spits out some coolant after riding several times the level inside stabilizes.

I use an aluminum water bottle for hiking and drilled two holes in the cap large enough that the hose I used was a snug fit. Put some soapy water on the hoses and slide them through the cap. Zip tie the bottle to the frame. Cut ties to rotate bottle out from under cap when re-filling is required. Simple, no threaded fittings, and inexpensive.

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