Bugger

[nickodemon]

The rads on the fazer are generally pretty good. i would be more inclined to look at hoses. I wouldn't have put a 'rad weld type gunk' in, as it's more likely to be a pin hole in one of the hoses. I generally avoid putting stuff like that in a motorcycle engine when rads can be repaired fairly cheaply and a hose ain't going to break the bank... Best of luck! Hope you get a permanent solution