My bike and my buddy's bike's (01 400E, 02 400E) have never overheated or used a drop of antifreeze except for seals or hose clamps blowing. My 2 stroke KTM's used to use a little antifreeze on almost every ride so I've been very impressed with this trait. I ride so very slow, muddy technical terrain at times and I do not have the fan kit. Just don't leave the bike idle for extended periods. If you have to stop and wait for something, shut it down and use the happy button when you're ready to go.