I could smell antifreeze when I got home from a 3hr none stop ride the other day,so I was searching for the leak,removed the tupperware,and found it had leaked from the cap of the expansion tank which is grey in colour and hard to see the level,could not get the rubber cap to fit on properly,so removed it and did aliittle filing around the top as it looked out of shape,this tank is not well made or white so you can see the level, like the one on my ST1300,anyway made the cap fit good,and we,ll see what happens next time out.