What's this small reservoir? - Yamaha FZ6 Forums - FZ6 Motorcycle Forum
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post #1 of 6 (permalink) Old 05-17-2019, 07:46 PM Thread Starter
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What's this small reservoir?

Hi everybody, I was wondering what the small white square reservoir near the rear brake fluid reservoir is?
It's on a faired 2006 Fz6.
Any help?
Cheers.
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post #2 of 6 (permalink) Old 12-30-2019, 10:40 PM
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Sounds like a coolant reservoir, pictures would help though.
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Last edited by supernova12034; 12-30-2019 at 10:48 PM.
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post #3 of 6 (permalink) Old 01-22-2020, 11:27 PM
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It is the coolant over flow bottle/reservoir. I have an '05. The fully faired version is the FZ6R. There are some differences between that and the FZ6. Note that in Europe there is also a FZ6N naked version, which might interest you since you are going that route. You can get some FZ6N parts from Yamaha.

Tupelo, MS
'05 FZ6
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post #4 of 6 (permalink) Old 04-07-2021, 07:06 AM
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Somebody can explain to me that reservoir too?

I dont understand what is used for. Its used to "catch" the overflown cooling system fluid?

Or the cooling system TAKE fluid from here when is low?

What does this?
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post #5 of 6 (permalink) Old 04-07-2021, 12:07 PM
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Quote:
Originally Posted by leorojasma View Post
Somebody can explain to me that reservoir too?

I dont understand what is used for. Its used to "catch" the overflown cooling system fluid?

Or the cooling system TAKE fluid from here when is low?

What does this?
A little of both. Coolant, like everything else, expands when it gets hot and contracts when it gets cold. As the system warms up, some of the coolant in the system gets pushed into the overflow reservoir. This is why the '"hot" level is higher on the bottle. As it cools back down, some of that coolant is drawn back into the system. Again, why the "cold" level is lower on the bottle. Keeping the coolant between the hot and cold levels is the ideal. Depending on when you check the coolant level, that gives you an idea which level to look at.

There's a lot more to the cooling system, but this is a simplified answer to your question. Every modern liquid cooled vehicle has some form of expansion or overflow tank. Otherwise you would lose a little coolant when it got hot, and need to top it off on a regular basis. Modern systems are usually designed to allow for a little overheating w/o puking coolant on the ground, since its now considered a hazardous material that can harm the environment if just dumped on the ground.
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post #6 of 6 (permalink) Old 04-07-2021, 08:10 PM
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Originally Posted by EricV View Post
A little of both. Coolant, like everything else, expands when it gets hot and contracts when it gets cold. As the system warms up, some of the coolant in the system gets pushed into the overflow reservoir. This is why the '"hot" level is higher on the bottle. As it cools back down, some of that coolant is drawn back into the system. Again, why the "cold" level is lower on the bottle. Keeping the coolant between the hot and cold levels is the ideal. Depending on when you check the coolant level, that gives you an idea which level to look at.

There's a lot more to the cooling system, but this is a simplified answer to your question. Every modern liquid cooled vehicle has some form of expansion or overflow tank. Otherwise you would lose a little coolant when it got hot, and need to top it off on a regular basis. Modern systems are usually designed to allow for a little overheating w/o puking coolant on the ground, since its now considered a hazardous material that can harm the environment if just dumped on the ground.
O men, excelent answer, now everything make sense.

It makes perfect sense a reservoir, becasue if there isn't, everytime the coolant expands because of heat/pressure, the system would lose a little bit a coolant everytime, draying out eventually.

Thanks bro.
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