Problem with me water
 

Got back from a short blast to get some chain lube(25miles or so)stopped to do lottery,got back on the bike and the temp guage was on 90,got home and the was coolant on the rear hugger and exhuast:( Popped the seat off ,no sign of split header tank,but there`s a hole in the filler cap,looks like there should be a valve or type thingy in it but it`s not there now the only thing I can think of is I might have over filled it last week.Now the thing is I want to go to Cadwell in morning,I`ve never had fluid come out before even on the hottest days,so I`m thinking the over fill could have caused this,if so should I plug it or run with it open?I have removed some fluid and checked for air locks.

That'll be the vent to allow excess coolant out when it gets hot if the bike has been overfilled.
Mine looks just the same
I'd put it back.........check your level tomorrow morning before you start the bike just to be sure your level is correct.

When you say vent do you mean valve or just a hole?There`s a valve type affair in the middle but the outside hole is"just a hole"

Just been out in the garage,ran the old gal till the fan cut in,about 100degrees,with the bottle cap off.No pressure build up,all hoses and radiator hot,just probably overfilled it.The temperature dropped after the fan cut in,then fan cut out,ran it`s some more fan cut in again,switched off,fan still ran for a minute or two,all seems ok.

Fingers crossed

sounds like the bikes a binner mate. :lol::lol::lol:

Cheers mate:P

Your bike is as it should be, just excess coolant more then likely. I had the same on my bike first big ride after service. I was paranoid so I cleaned up the rear cylinder, which also had coolant splatter on it just to make sure gaskets weren't leaking.

But if you decide to bin it I am after some bits... :sing:

Yep, tottaly agree, just slightly overful. Mine's done it too.


Ride on,

Rob

a coolant system should not have any open vent in it,
otherwise it would not be able to run under pressure,
and would therefore boil

There`s a pressurised cap on the radiator of course,I think there should be a release valve in the header cap,but there isn`t one:puzzled:there is still something not right,an airlock perhaps??Got home from DD,temp guage on about 80,switch off and the fan cuts in:puzzled:
How do you remove an airlock?Has anyone got a picture of there cap so I can compare?There is an allen bolt at the bottom of the rear cylinder which releases coolant when you undo it,but what`s the correct proceedure?