Main Motorcycle: Rickman T120
Join Date: May 2010
Location: Victoria Australia
Other Motorcycle: T160,TR6
I'd say number 2 is a photographic mistake.The negative was upside down,so it's shown in mirror image;it would actually be the same camplate as number 1.
You can take your pick.They would all work.
The neutral notch between 2nd and 3rd does make assembly and indexing easy.The quadrant looks central in that position,so indexing is simple.You would never use that neutral position during normal riding.You would shift 2nd to 3rd,with no 1/2-shift.
Neutral between 4th and 3rd can be some use,if you like "angel gear"/ "Georgia overdrive" going downhill.It actually can be useful to pinpoint noises/vibrations,whether they are frame related or engine related.