I have confirmed with Y.S. Service here in the U.S. the following:

The lower oil set-up includes a different crankshaft and cam follower, some of the newer 170's already may have these items in place. You can tell if your your motor is set-up for lower oil content by looking at the cam follower and crankshaft. The newer cam follower has a spiral cut on the side of it and the newer crankshaft has a hole on the back of the crank pin. I'm sorry that I don't have any pictures to post.

The CDI conversion unit has a new head to accept the spark plug and spark plug cap.

Mike Wickizer