what is this called

[auldyin]

hi on lifting my tank on my 02 plate sv650 i noticed the air filter box ok manual said it would be there i also noticer the radiator cap said it would be there as well but it doesnt say anything about a black box thing just behind the radiator and is connected by a pipe to the rad just below the filler cap i also noticed the black box thing has a small white window in it but noting showing in window is this normal

[Red ones]

If it has two lines on the white bit, then its called an expansion tank and there should be enough coolant in it to the bottom of the 2 lines.

[PeterM]

Exactly! Should be on the right hand side when looking from the riders seat.

[auldyin]

thats right what have i to do with it whats it for???

[instigator]

thats right what have i to do with it whats it for???

Top it up with coolant when needed. Make sure the coolant is between the two markers. :)

Coolant 'expansion' tank....says it all really. :lol: :)

[chazzyb]

I have a '99 bike. I can't see the coolant level through the window on mine. It's there though; but the window is now rather opaque.

[Blue_SV650S]

As has been explained top the expansion tank up to between the marks. Whilst you are at it, pop the radiator cap off and fill the radiator to the brim. Make a note of how much water it takes to fill. It shouldn’t be much (if any) if it takes a cupful or more, then make sure you don’t have a coolant leak somewhere.

[philipMac]

I have a '99 bike. I can't see the coolant level through the window on mine. It's there though; but the window is now rather opaque.
Get a torch in there, and shine the light from behind and then look. Its awkward but it will work if tis opaque