K2 Busa Coolant leak...why??

[Chubbsy]

I've just replaced the coolant on my beloved KS Busa but the level keeps going down on the expansion tank. I rode today for about 20 miles and the level has dropped from the full to the lower mark. The weird thing is there is no sign of any leak whatsoever and all the hoses are tight. Any idea's anyone? Thanks Steve

[twotonevert]

Welcome to the oRg Steve, did you burp the system and make sure you got all the air out?

[cheferman65]

Yes Steve,

In the service manual there is a very specific protocol for coolant system change. You probably should give it a look. Sounds like there is lots of air in the system.

[Chubbsy]

Thanks it seems better now after a 3rd top-up - guess it was just air bleeding out.

[Chubbsy]

yes, it seems better now after 3 top-ups - thanks