hi, i recently put a new frame on my 2011 sherco cabestany so therefore it was stripped to nothing and rebuilt. i had to drain my coolant to get radiatior and engine out the old frame. all i need to do now is top it back up....im not sure if i need to run the bike with the cap off then top it up?? or keep cap on run bike then take it off and top it up? hopefully some1 can help. thanks