Did you try and remove the radiator cap to see if the coolant was actually boiling? Sounds like your bike runs hot generally, min sits between 78 and 85 on every ride unless I'm sat in traffic
Radiator cap not holding pressure? [/quoteThat was the cure to a similar problem I had. Genuine Yam cap not cheap, but been fine ever since.]
no noticeable leakage from the cap
Gnasher - hauzitgaun?
I drained coolant (it was pink - I'd done it when dropping the rad a couple of years ago to replace plugs - will be doing that again shortly..)Coolant was pre-mixed (i.e. not solution +makeup water)Everthing was/is clean - I flushed with Radflush and nothing - hoses and rad all clean internally
I was hence thinking an airlock?
@gnasher, also long time no see.
@Moff, have you checked the thermostat is working and at what temp..?
He changed it mate
maybe airlock maybe duff radiator cap?