I can't get the clutch assembly off.
 

I'm having trouble getting the clutch assembly off of my '81 gs450e, after taking the main bolt out of the center. I've been using a slide hammer and haven't noticed any movement. Not sure if I ought to hit it harder. If you any one can help it would be greatly appreciated.

I'm taking bike apart since the bike ran out of oil then wouldn't turn over. Trying to get to the crankshaft since pistons aren't stuck like I thought.

Thanks