tapered piston rings

Joined
Apr 30, 2005
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I'm brand new to this site, trying to reassemble a 69 Commando Fastback 750, my first bike project. And the question I'm going to ask should definitely have been asked before I put the cylinder barrel back on. But I couldn't wait.
I've got two sets of compression rings, one with a tapered inside edge, one without. Does anybody know which to use, and/or which goes where? The manual is vague, but seems to indicate the middle ring is tapered, with the tapered side up, and the top ring is straight.

The pistons are original. The oil ring groove is the narrow one (apparently only early models had this) and takes skinny rings around the spacer (don't ask me how I learned this).

All help appreciated. I'm trying to learn how to do this.
 
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