Is it the kind of puller that has a couple bolts that supposedly thread into holes on the flywheel and a large central bolt that presses against the crankshaft?
If so, it probably won't work for your engine. I use the kind of "puller" that is a big haxagonal device that looks kind of like a screwdriver handle with no blade. This screws down onto the crankshaft after you take the nut off. Then you take a large screwdriver and pry upwards gently between the block and the flywheel and tap the top of the "screwdriver handle" that you screwed onto the crankshaft with a hammer until the flywheel pops off.
This is the tool I'm talking about
:
http://cgi.ebay.com/NEW-FLYWHEEL-PULLER-FOR-BRIGGS-AND-STRATTON-7-95-DEL_W0QQitemZ200223883803QQihZ010QQcategoryZ82248QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Agreed, a picture of the top of the flywheel would be great...