motorcycle overheating

[770]

Suzuki GSR600 2006

I have just changed the headgasket and changed the thermostat. My bike overheats where boiling coolant goes to the overflow tank and spits out on the floor. The temp gauge showed 60 celcius when this happened. There is also no sign of white smoke or contaminated oil/coolant. I have also bled the coolant system.

Any ideas?

[jaffa90]

Is it boiling / steaming ?
Why did you change the head gasket and thermostat?
Have you run the cold engine on idle/tickover with the radiator cap off for any air to come out?

[770]

[jaffa90]

Radiator cap and/or seat ok? Have you heard the fan kick in yet?
It could be a very weak mixture as well.

[WD Forte]

have you checked the pump function ?
I also check temp gauge accuracy with an IR thermometer.,
Just cos it says one thing doesn't make it true and any indicated temp
however accurate is only in the region of the sender unit.

I assume they skimmed the head?
was it checked for straightness and cracks after?
Does the fan cut in OK?
Assembly error?
FOD on new gasket?
Cracked bore?
____________________
bikers smell of wee

[Chris45]

[Polarbear]

My first bet from what you describe would be a circulation problem, airlocked or waterpump. You should be able to tell by checking the hoses in and out of the radiator, are they hot and cold.

If it is the head I would expect some kid of contamination. It will be cylinder combustion pressure blowing into the water chambers.
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Triumph Trophy Launch Edition

[770]

Now i have flushed the radiator, checked the waterpump, tried running it without thermostat, compression test, made sure it is properly bled and flushed the system several times with radiator flush. I also have a spare temp sensor which acts the same as the old one. I have tried connecting the fan directly to the battery and it spins. I also checked the oil for contamination.

I was reading in the manual where it says: NOTE:
As coolant temperature rises, the cooling fan operates for 5 seconds
when the temperature arrives each at 50 °C, 70 °C and 90
°C.

The temp gauge have only reached 60C before boiling but the fan didn't run at 50C. I have checked connections and fuses. What about the relay? Things are getting beyond my knowledge here. All the hoses seem to have the same temperature too.

This is only at idle btw, I haven't tried to ride it

[Polarbear]

Definitely lack of water circulation. The engine is getting hot, water around the engine is getting hot. Water by the temp sensor, fan cut in and radiator isn't so showing a low tamp and fan not cutting in.
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Triumph Trophy Launch Edition

[WD Forte]