Coolant loss

Picked up my 955 speed triple on Saturday and rode it into work on Tuesday. When I parked up I noticed a small pool of coolant forming under the left hand side of the engine. I rode the bike home slowly keeping one eye on temperature reading, reached 195 in town and 175 out of town. Checked the bike over last night and noticed that the expansion tank was low but there is plenty of coolant in the system and it doesn't appear to be contaminated. Topped the expansion tank up, started the bike and let it warm up and I got another puddle on the floor (the coolant is exiting via a small pipe near the pump). A quick search seems to suggests that the expansion tank is best checked when hot or filled to below the minimum mark when cold, is this correct or should I be worried?

 

Registered 2003, there is some coolant in the tank, it's just below the minimum mark after the engine has cooled down. Taking it to work again today, I'll let you know how I get on.

 

Thanks for the replies, I didn't ride the bike yesterday, it was chucking it down, I'll try and get out on it at the weekend.

 

50 miles at the weekend and 60 miles to work yesterday and no further loss of coolant, I guess I should ignore the level marks.