radiator overflow tank

do i need this overflow tank, i ride michigan have never overheated my old bike.(02yz250). has anyone taken theirs off.

I also live in Michigan & I took mine off my 03 450 before I even started it. No problems just reroute the line down the down tube in front of the engine & cut to length. It’s always a good idea to check you level before you ride. :thumbsup:

do i need this overflow tank, i ride michigan have never overheated my old bike.(02yz250). has anyone taken theirs off.

...no you don't, it's only for eviromental reason since the coolant doesn't flow back from the overflow tank to the radiator :thumbsup:

I left mine installed and made it into a reserve fuel tank.

do i need this overflow tank, i ride michigan have never overheated my old bike.(02yz250). has anyone taken theirs off.

If you ever tweak a radiator, you will be glad that you have the extra coolant capacity to hopefully get you home.

...no you don't, it's only for eviromental reason since the coolant doesn't flow back from the overflow tank to the radiator :thumbsup:

It is not there for environmental reasons, it is NOT a catch tank!

It is a reservoir, the radiators can take extra coolant as well as dump coolant, this is what is the difference between an "environmental" catch tank and a reservoir.

If Yamaha were that environmentally concerned, they would have carby overflow catch tanks on these bikes as well.

mine is there for a reason and it is NOT coming off

I agree with Matty05, it is a resevoir tank, working both ways.

It is not there for environmental reasons, it is NOT a catch tank!

It is a reservoir, the radiators can take extra coolant as well as dump coolant...

That is absolutely correct. The overflow tank also keeps air bubbles out of the radiator. If you remove the overflow tank and send the overflow to a down tube when the coolant finally cools down and contracts you will just suck air back into the radiator. When you have an overflow tank the liquid can expand and contract keeping the system air free. liquid works much better than air at cooling a motor.

Chugging along on tight trails at low rpm's will over heat the piss out of that motor. It doesn't matter where you ride. The fact is there isn't enough airflow to cool down the coolant at low rpm's. That motor was meant to be run high and fast. If you chug the motor at slow speeds you will suck coolant from the over flow tank. When you hit an open spot and ride high and fast the coolant goes right back into the radiator.

Many folks spend money, time and effort to set up coolant recovery systems for their bikes. To compromise the cooling efficiency by removing the OEM coolant recovery system just doesn't make sense.

thanks for the great replys,think ill leave on the tank for a while.

You guys on WR's want to remove them, a lot of us on YZ using them for trail bikes are adding them..... just doesn't make sense.

-J

I reinstalled my coolent tank and added some other cooling items to my system. Like 16 dollar coolent and an in-line coolent cooler. Cooler motor = more horse power.

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