Coolant leak

[Haggis]

Knackered seal on the radiator cap was my water problem.
I think I was looking too hard for something interesting.

[Caz]

as a general rule, if something starts playing up after you have changed/broken/lost something then thats the first place to start
as i said in my previous post, it should be a sealed system

glad you got it sorted!!

[ross59]

Given up........ doing the head gasket this weekend should be fun, just hoping that is it

[rover220]

I have to fill my bike up with coolant every 100 miles or so, is this normal??? It comes out the overflow on the expansion bottle when stationary but is barely noticable. The cap on the expansion bottle isn't the right one as it fell off an i have been unable to find a replacement yet could this cause an issue as it doesn't seem to be sucking it back like it used too? I have checked for the obvious signs of the head gasket going but all seems ok. :smt013

sounds to me like you have a leak in the system. Im assuming that the bike isnt pissing coolant, so it is possibly caused by the incorrect reservoir cap? the coolant circuit needs to be a sealed system, if it isnt sealed you run the risk of coolant evaporating when the bike gets hot.

Id get the correct reservoir cap on asap and then see if you still have a problem, and also check that you have no air in the system. That could be another reason for you having to top the coolant up every 100 miles or so

the expansion tank isnt selaed though so it wont be the cap causing the problem. rad cap maybe but not expansion tank cap.

[ross59]

Head Gasket done and all working fine, problem solved took it out for a hours ride no issues no leaks.