Well we're not going to get any help from India....
So far I have found that the AV1 is more or less the same but all the other varrients are just a mish mash of parts from other Petter engines or other general engines adapted to fit the Petter style block.
A short list of bores:
80, 85, 87.5, 95, 102, 114.3, 120 mm
76 mm ( something I've never seen in a mini Petter )
A short list of strokes:
80, 110, 115, 116, 120 mm
76, 125, 95 mm ( just found these strokes). Would you believe they rated a 120mm-125 stroke to 18 Hp at 1800?
This is truely amazing stuff that a simple engine could morf into so many varients. There is a Petter style engine for nearly every aplication. The only trouble is you need to understand what engines are best suited to what loads and speed ranges because this information is not published. The list of engines you posts does offer some interesting insights.
Doug