1987 TE 510 Reverse Flywheel (Puller)

I have a 1987 TE 510 that has the reverse Magneto . The Stator is mounted to the outside case .
I was told that the puller size was 26mm . Not . its bigger than the 26mm . It looks alot bigger ?
I called Halls they told me they didnt have 1 & didnt know the size of it .
Reason why i am pulling flywheel i think i may have partially distorted the woodruff key .
If thats possible ?
Bike runs like crap, loads up (Black soot) @ tailpipe im just checking all possibilities then i will know for sure.
ALL Help Greatly Appreciated .