hi all just had a new head on my bike n now after 10 mins of riding the coolant exspansion bottle has loads of airt bubles goin up to it and then fills right up and starts pissing out. and the temp gauge starts going up.

i have tried bleeding the system doesnt seem to be doing anything and have made sure has enough collant in it??????? really annoying as i just gt the bikwe back running and have run it in then it does this. im getting fed up of the god dam thing.

new cylinder head?

So - take the rad cap off - have you enough fluid and what does it look like?

take the oil filler off - what does the oil look like?

You need to make sure the rads are full and no air locks. Fluid out the system is not too bad..it finds its level.

Sounds to me like the head gasket has gone mate. If there is constant bubbles in the tank when running then it is less likely to be excess air trapped unless it wasn't bled correctly in the first place. What sort of temperatures was it getting to when it was getting hot?

hi erm attemtped another bleed didnt work.
tried diff rad cap.

and i reckon u r correct head gasket as there is constant flow of bubbles going through the pipe to the exspansion bottle when heats up. n i did notice when riding was coming up to hot probs bout 110'c

Hi, you could try taking the thermosat out and see if its still overheating, sometimes they stick shut.
Cheers
Ian

Also check your coolant temp sensor isnt reading high.

There is also a coolant tester you can get, to see if there is exhaust gases coming though your cooling system.

dannyboy wrote:hi erm attemtped another bleed didnt work.
tried diff rad cap.

and i reckon u r correct head gasket as there is constant flow of bubbles going through the pipe to the exspansion bottle when heats up. n i did notice when riding was coming up to hot probs bout 110'c

you did put a new head-gasket on when you changed the head didn't you?

right it was the head gasket pressureizing the colling system. n yes did change the gasket but wasnt a genuine honda one so thats wats in it now n all is running sweet