I have not used this method on a 2 cyl Briggs but in principal it should be OK.
Assuming retaining nut is loose or removed.
Once you have some tension on puller, using a rubber or wooden mallet, try tapping around the edge of the flywheel (avoiding damage to any fins etc). If there is an area you can tap from underneath try this also. You can rotate the flywheel whilst doing this to ease it all round. This should break it free from the tapper. If it does not work first time try adding a little more tension to puller & repeat.
I hope this solves your problem.
Robin S
September 2008