Kawasaki  FH721V AS15 25 HP ENGINE 
UPPER OILS SEAL LEAKING - REPLACED AND LEAKING AGAIN AFTER 10 MIN 
I GUESS FROM THE  VIBRATION FROM CRANKSHAFT 
I AM LOOKING ON THE PARTS DIAGRAM AND I DONT SEE ANY REPLACEMENT  FOR THE BEARINGS OR SLEEVE
ANY HELP WOULD BE APPRECIATED
 
THANKS
CHESTER
 
  
 

Looking at the parts diagram, as you are, there no separate sleeve or bearing..
 
https://www.jackssmallengines.com/jacks-parts-lookup/manufacturer/kawasaki/4-stroke-engine/fh721v/fh721v-as15-4-stroke-engine-fh721v/lubrication-equipment 

Any suggestions on how I should fix it
Thanks

Can you feel any back and forth movement with the crankshaft?
 
Is there (should be) a hole for oil to be pumped just below the seal/or at the crankshaft itself.  
If the hole is visible, and the seal set too deep, it can stop the oil flow and burn up the seal..
 
.
 
.

I replaced the seal . Put it back together
Started up and noted the flywheel had a wobble and vibration

I put the new oil seal in ,put it back together and started it that's when I noticed vibration and the flywheel had a wobble to it

Could the flywheel have been put back on wrong ? If not then it must be the crank shaft bearing
How can you tell if the bearing is bad on the crank

Yes

The flywheel should be tapered and fit "square" / flat with no wobble.  
 
Can you push the flywheel BACK AND FORTH, even a little, with a pry bar?  
 
Was there any event (machine striking something, etc) just before issues arose?
 
And the block IS the bearing looking at the parts diagram.
 
Thinking about it, a worn block would allow the flywheel to have the above mentioned play.
For it to wobble, it's either not seated, the crankshaft bent,  etc..
 
.

There is wobble on the crank shaft
Have trouble uploading video
But there is some wobble

If the crank is wobbling, and there is no play(between the crank and case) it sounds like the crankshaft itself is bent. 
 
Did it hit any objects or stop suddenly??
 
.