With the springs removed, this magneto will produce a weak spark by giving the armature a quick spin by hand and scratching the lead out wire against my steel bench. I don’t believe it’s enough spark to start or run an engine however. 2″ x 2″ mounting. I believe this is a good candidate for a rebuild. Mounting holes are solid. There is one small crack in the pot metal base next to one of the mounting holes as you can see in the pictures! See pictures for the absolute best description!