Radiator over flow bottle

andretheox · Nov 18, 2004

Hi guys , here in South Africa the climate is very hot and when doing technical riding my 04 FE450 boils over a lot. I have fitted and over flow bottle behind the right rear number board. The excess fluid is stored in the bottle and then sucked back into the radiator when the temp cools down during riding. The bottle I have used is the Yamaha Raptor and is easily fitted. I have pictures if anyone wants to see.

Splat · Nov 18, 2004

I am using the same bottle as the Yamaha WR450. Cost $36.00. Probably the same set-up as yours. It works really well, no more having to refill the radiator after a couple hours of singletrack riding.

correcaminos · Nov 19, 2004

Please i want to see that photos.....thanks

wildbill · Nov 19, 2004

correcaminos said:
Please i want to see that photos.....thanks

Yes I would be interested also.Would like to see what you did and how so I would have a idea.Thanks

andretheox · Dec 1, 2004

pic of over flow bottle , more to follow

correcaminos said:
Please i want to see that photos.....thanks

wildbill · Dec 1, 2004

Re: pic of over flow bottle , more to follow

andretheox said:
correcaminos said:

Please i want to see that photos.....thanks

Click to expand...

That is interesting setup.Is there anyway to mount something like that closer and higher to the overflow?Thanks and take care.

Splat · Dec 1, 2004

You don't need to mount it higher. Mine works just fine mounted in the same spot as his. If your radiator cap in in good condition, the fluid will draw back up the hose just fine.

andretheox · Dec 2, 2004

Re: pic of over flow bottle , more to follow

wildbill said:
andretheox said:

correcaminos said:

Please i want to see that photos.....thanks

Click to expand...

Click to expand...

That is interesting setup.Is there anyway to mount something like that closer and higher to the overflow?Thanks and take care.

You dont need to mount it closer to the radiator as the pipes are a closed system. The bottle could be lower than the radiator as a vacume occurs when the radiator cools down and thus sucks the coolant back in. What I did need to do it to alu weld the exit from the radiator as mine was a plastic one only made to expel excess coolant. I also needed to make spacers from plastic bar to space the bottle away from the wheel when the shock is compressed.

correcaminos · Dec 2, 2004

I am sorry, but:

The coolant will NOT return to the radiator because the valve of the radiator cap is opened only by the pressure of an overheating; . In order that the water can return to the radiator it will have another entry to the radiator, like the WRs.

Hope it helps

andretheox · Dec 2, 2004

correcaminos said:
I am sorry, but:

The coolant will NOT return to the radiator because the valve of the radiator cap is opened only by the pressure of an overheating; . In order that the water can return to the radiator it will have another entry to the radiator, like the WRs.

Hope it helps

It does return as the cap has an inlet valve installed in it as standard. I can send pics if you want. At the end of my rides the bottle is always empty.

correcaminos · Dec 2, 2004

Ok, i want to see that inlet valve.....

andretheox · Dec 2, 2004

correcaminos said:
Ok, i want to see that inlet valve.....

I will take pics over the weekend , if you want to look for yourself , take the radiator cap of and you will see that under the main seal that seets the cap onto the base of the radiator there is a smaller seal which can come down if you place a thin scew driver in and very gently push it down , this is the return valve I am talking about.

DOLLARS · Dec 2, 2004

There is definately a return valve in the cap but it will only work if you still have the larger rubber seal in place that seals the cap against the top of the rad.If there wasn't a return valve in the cap it would suck in the hoses as the engine cools.

Splat · Dec 2, 2004

My radiator cap also allows the coolant to be drawn back into the radiator. If your cap is worn or defective, then you could have a problem. I am using a KTM cap since the Husaberg dealer is 50 miles farther from me than the KTM dealer. The cap for a KTM85sx works fine for the Husaberg radiator.

wildbill · Dec 2, 2004

This looks similar to the coolant recovery setup on a auto.The system shown should work.I still don`t see why mounting the overflow up near the radiator shouldn`t work(if there is a place to mount it).Did any of you check in that area to see if it could be done?or for that matter up behind the front number plate?(say similar to a GasGas)I like the setup just want to see if it could be done differently thats all.

andretheox · Dec 3, 2004

wildbill said:
This looks similar to the coolant recovery setup on a auto.The system shown should work.I still don`t see why mounting the overflow up near the radiator shouldn`t work(if there is a place to mount it).Did any of you check in that area to see if it could be done?or for that matter up behind the front number plate?(say similar to a GasGas)I like the setup just want to see if it could be done differently thats all.

You can mount the bottle where ever there is space ( below or above the rad) as long as the return pipe is placed at the bottom of the bottle ( so it can suck) , at first I placed the bottle near the bash plate I will look for pics and post them.

andretheox · Dec 3, 2004

andretheox said:
wildbill said:

This looks similar to the coolant recovery setup on a auto.The system shown should work.I still don`t see why mounting the overflow up near the radiator shouldn`t work(if there is a place to mount it).Did any of you check in that area to see if it could be done?or for that matter up behind the front number plate?(say similar to a GasGas)I like the setup just want to see if it could be done differently thats all.

Click to expand...

You can mount the bottle where ever there is space ( below or above the rad) as long as the return pipe is placed at the bottom of the bottle ( so it can suck) , at first I placed the bottle near the bash plate I will look for pics and post them.

This bottle worked just ad well but held less volume so I replaced it with the raptor one.

Splat · Dec 4, 2004

Honda and Yamaha both put their bottles near the rear tire.

You could fit a 12 ounce gatorade bottle next to the rectifier, on the mud flap near the rear shock. I saw a guy do that, and I copied it, but 12 ounces wasn't enough for some of our really tight trails in the summer, and I literally blew the top off the bottle. I haven't had any problems since mounting the Yamaha bottle near the back tire.

The Yamaha bottle set-up works very well and doesn't look like a mickey mouse add-on.

It looks like a factory installed accessory.

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