My 'busa is the first bike I've ridden with a slipper clutch.
Sometimes my gear changes aren't as smooth as I'd like them to be and I'm pretty sure this is because of extra drivetrain lash due to the two-piece clutch hub design.
Some 'busa owners have their clutch hub welded to eliminate the play especially for drag racing applications.
Are all slipper clutches like this?
Is there any other way to reduce play short of welding the hub?