February 1, 2012 10:38 AM PST
I was a passenger for 30 years before riding my own. So, my opinion is not based on what some manual says, but based on how I ride, no matter what position I am in on the bike.
A passenger is either holding on to the "throttle-master", or sitting back against the sissy bar. I can't think of another safe option.
If they are holding on, any movement their body makes is naturally in line with the body they are holding on to. The passenger isn't the one making the move, nor should they be making any moves to counter-balance the motion of the person they are holding on to.
If they are back against the sissy bar, they are a part of the bike. They should keep their shoulders square with the bike, even in turns.
A passenger should NEVER make an effort to lean to the side. It's not necessary. Now, leaning slightly forward when starting out from a dead stop, or leaning slightly back when coming to a stop are fine.
Oh...and once you are on the bike, KEEP YOUR FEET ON THE PEGS!! I once had a guy ride behind me and he kept putting his feet down. That wasn't bad when I was stopped, but when he picked up one heavy workboot at a time as I was slowly starting out...ohhhh, THAT was a surprise!