Radiator problems...

[darrsi]

nom nom nom tastes good :lol If I'm eating my hat your drinking that radflush because we were both wrong! Scale in the cooling system yeah right! Badger in it more likely :lol If he was losing pressure from a lose clamp the coolant might have boiled before the thermostat was hot enough to open so that'd explain why the rad stayed cold.

I do believe I did mention checking jubilee clips as well?  :b

I've had 2 bikes with a clogged system before, that's why I'm so familiar with it.
I used to sit at lights watching the bike piss itself out of the overflow pipe, which was embarrassing, and the Radflush sorted both bikes out.

Personally I would still do it anyway as it's an engine he knows little about and there's a good chance it may never have been done before.
You gotta keep your waterworks in good nick.