Hmm strange I'll have a better look at mine as I have two of each base and I haven't noticed changes as their bases where used for both two and four strokes.If you have a look at a Sheerline base you can clearly see the holes for the spacer plate on the for the four star.I wonder if one hasn't been changed as they weren't the strongest bases ever made and even earlier on some where changed.The picture from the green books really only give a rough idea.As if you look you'll see two hollowed bits for the carby on the two stroke.Only the consul 2 had those as their carbys were on the opposite side from other two strokes.Does the four stroke base have hole on the wheel at the bottom of the handles where a screw can go in?
They do have the right carbys on them and yes it is the right air cleaner for the four star.Bugger I've never been able to find one.Good work there.
