I was thinking triple slug too, but too lazy to look it up. The backplate was beveled as shown, but has no pole vent (probably what you were thinking Jim). The diameter of the slugs looks too small tho, considering that's a side view of a 10.Weren't they a triple-slug motor with a flat backplate?
My memory is probably off, though...been years since I paid attention to MTs.
SR sounds more like it. But then, the OP is using an alias name, so this is probably just a troll. Im guessing he is masturbating to all the serious replies at this moment.Sorry man, but that's an old RE SR 10. There was 2 at the local audio shop a while back a guy had traded in for some crossfire BMF's.. Did a little research since they didn't know what series they were, and found out they were SR's..