If you can't get a puller ive taken off similar setups by taking the nut off the shaft flipping it around backwards and rethreading it on (but leave the nut to where it protrudes a lil bit further then the shaft) take a small pry (i use a mechanics pry) and het the pry behind the fly wheel (make sure your only against the flywheel body)
And apply steady medium pressure while lightly tapping the nut with a hammer and it'll come off pretty easily. Having the nut reversed and extended from the shaft will protect the shaft from mushrooming.
Just remember to tap lightly