The design spec for the Twin Cam engines was 230°F oil temperature at a standard ambient air temperature, roughly 70°F. That was back before the engines got bigger and the tune for emissions made them run hotter. These days, I'd expect a stock bike to run over 240°F oil temp, and go up from there when the ambient temps are higher and riding conditions are less than ideal. A good synthetic oil will easily handle well over 300°F. Ideally I'd like to keep it under 250, but it's not something I worry about. I don't even have one of those unreliable dipsticks, and don't feel the need to check oil temps anyway. As I've mentioned before to all those who obsess over oil temps and want to be able to constantly monitor them, what do you plan to do if your oil temp exceeds your personal idea of a good maximum, pull over and park for an hour or two to let things cool down, or use some common sense?
Jerry