I run Amsoil MCF 10W40, has never been over 220 since. The time I pegged the gauge was with conventional Motorcycle oil, don't remember the brand, that was back in 2007.
Amsoil offers a MCF 10W30, 10W40, and 20W50.
I personally think with the minimal clearances in these engines, the 20W50 is too thick, but thats just one mans opinion.