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MotoGP God
Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,084
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Check the state of your hoses as they'll be 15+ years now if they're originals and may be starting to degrade, and harden then crack.
When refilling I always find that squashing the hoses in and out of the radiator helps to squeeze out the air bubbles and get the coolant moving around a bit before running up!