Reasons for coolant to leak from breather hose?

mine does this after a run, just a dribble. must be old age like the owner

onmine it does it after ive leant the bike (and its hot) so a little dribble down the overflow. If its just a few spots i would be overly concerned. tbh i would replace the rad cap ater using rad weld anyways. Allways good to replace them every few years anyhow imo. Which reminds me better get one on order

I know nuffin but -----water expands when it is hot and if you are filling it to the max level there may not be enough air gap left to allow for the expansion. After the excess water has come out is the water level still above minimum,is there an expansion tank? Radweld tends to cause sludge in a radiator impeding the water flow and can,although not necessarily, partially block the radiator making the engine run hotter expanding the water more.Did you fill it with coolant or just water as this can make a difference to the operating temperature
I have no leaks or radiator sealant in mine but if I fill it to the max level it tends to chuck out about a cup full of coolant bringing it down to the minimum level which is commonly known as "Finding its own level" a frequent occurrence in many engines
There is not necessarily anything wrong it just depends on the engine finding its own operating parameters with regard to coolant level

[yorkie_chris]

So how did you add radweld? Where did you put it? System should be absolutely full to brim.

If it is spitting out of overflow then either it is blowing gas into system or it is overfilled and normal expansion is resulting in coolant loss.

Expansion tank only needs (generously) 100ml above level of pipe from cap to work properly. You can even have them empty when cold and not cause any particular issue, water goes in when it heats up, gets sucked back when it cools down.


Or like dicky says, you can let it find it's own level in tank. However if the level in the radiator itself is dropping then you have more serious issues.

[maviczap]

Originally Posted by andrewsmith

That may be a cause. My SV's coolant system had an issue with leaks from the breather hose. The jubilee clips were loose and causing the leaks

Thats because jubilee clips aren't the best idea for raidiator hoses.

Proper hose clips which expand and contract with the pipe are the best thing to use

[andrewsmith]

Originally Posted by maviczap

Thats because jubilee clips aren't the best idea for raidiator hoses.

Proper hose clips which expand and contract with the pipe are the best thing to use

swapped to 1/4" hose clips

[dizzyblonde]

Originally Posted by yorkie_chris

So how did you add radweld? Where did you put it? System should be absolutely full to brim.

.

Its been peeing out a bit from the breather hose last few times I've been out, so the amount I put in, only covered what has been spat out.
Its not a lot, about a table spoon full each time it ***** its leg!!
The rad wasn't leaking as generously as it was when we got it home when bought it, but in the same place they all go....but its mighty funny its always Pete that breaks it
SO, As per what it says ont bottle. In through the rad cap, cold. Start up run til fan kicks in...fair old while to get it circulating and 105 degrees for a Raptor, switch off and leave to work its magic. As rad cools it finds its way out of the hole and fills it on exit.
Have you never used it?
I put in about 45 ml......125 ml of Radweld does 7 litres, and the Raptor coolant capacity is 2000 mls, so I reckons it was around about right..seems to have held anyway.
The rad was full when I took off the cap before I put it in.....either way its bloody in there now

[Bibio]

i'll echo what the rest have said... its finding its own level. if its only a table spoon at a time stop filling the bloody header tank up and let it get on with it. i would only worry if it started to loose level to the radiator. just keep an eye on it.

[yorkie_chris]

Originally Posted by maviczap

Thats because jubilee clips aren't the best idea for raidiator hoses.

Proper hose clips which expand and contract with the pipe are the best thing to use

They work fine, not really any pressure there to worry about. Stock spring clips are OK, even cable tie

[dizzyblonde]

Originally Posted by Bibio

i'll echo what the rest have said... its finding its own level. if its only a table spoon at a time stop filling the bloody header tank up and let it get on with it. i would only worry if it started to loose level to the radiator. just keep an eye on it.

It hasn't been filled since June last year. Which is why I asked the question, as it never did it then, and its only doing it recently. It started long before I had to Radweld the radiator.

I've said this more than once now

I think I've already decided that I've to keep an eye on it, its like a little game of peek a boo


Keeping an eye on the level in the radiator is slightly more complicated. To gain access to the cap, I need to find my security torx keys, undo the torx bolts holing the indicators on the fairing, take the orange lens off as weel , to gain access to a third screw to the fairing thats hidden inside, without cracking the precious rare lens! Then and only then can I take off the rad cap1

The innovations and intricacies of Italian design-----Much easier when you have a header bottle/tank with level marks that you can see.
Q---does the Raptor have a header tank/bottle?