Not sure if we are talking about the same thing, but MY '11 RGU does not have the start bang I would always hear. I presumed it's because of the SE compensator... I was so used to the loud bang at start, when I first got the '11 it took me a couple days to get used to starting it.
Thanks, I found it. It says the new clutch hub bearing "retro-fits back as an assembly", which apparently means replacing the entire clutch hub. What it doesn't say is WHY they made the change.