I try to baby my fat boy. I let it warm up until I feel that the top of the rear jug is plenty warm. I keep the RPMs low for the first few miles to allow for further warming up. Also, I granny shift pretty much all the time. However, I've been known to open up the throttle. Obviously, the harder the engine works, the more likely it is to break down (given enough miles). I'm just being paranoid and want to do everything reasonable that I can to ensure the long life of the bike. I already know about changing the fluid in the bike, but what else?