And the coolant never stops flowing. It'll take some time for the bike to over heat at just idle, unless of course your jetting/ lean or what ever is fucked up.
But a simple test, let your bike idle for 20 minutes and touch the pipe, maybe not it'll be kind of hot. Now go rip for 20 minutes and touch the pipe, Fuck that. Simple shit, don't over think abs over complicate things.