Without it you would not be able to disengage the clutch. I promise.
Originally Posted by 2door
If your clutch works then the ball bearing is in there. Without it you would not be able to disengage the clutch. I promise. It's there but stuck in grease/goop. If you have a strong pencil magnet you can get it out to clean and re-lubricate.
I'm assuming you know the bearing goes in behind the steel pin that protrudes from the center of the sprocket.
I'll second that...the ball is in there. Without the ball the pin (bucking bar) won't stick out far enough for the clutch arm to push it in and disengage the flywheel. It's a 3/16" ball, and will cause the pin to protrude out of the shaft by about 1/4".