I saw recommendations for the suction cup mount but be very careful where you put it on the bike and make sure to tether it to either yourself or the bike somehow. I lost a brand new hero2 on my first ride out using the suction cup mount so I don't trust it on a motorcycle, but I've seen it on others. Your call. But like I said, tether system is HIGHLY recommended.
Personally, I would also recommend the Wi-Fi system to turn the camera on and off. If you have a cigarette lighter, a charger that plugs in to it and then the Wi-Fi would enable you to keep the Wi-Fi on indefinately. When you are not filming, you can turn the Hero off with the Remote to preserve the Battery. If you plan to fim more than about 2 hours, a skeleton case for the Hero and a charger hooked up to the Hero, along with extra SD Memory would be called for.