D .. The R100 came out with a 12A factory ?? I swear mine had a 10A in it

They did infact make a 12A triple in the 70,s and you can still buy a new factory create motor as I saw 2 for sale in japan last year. Not sure what it was called. The twin rotor 15A and 21A never got off the ground as far as I know due to seals but the Le Mans you refer to was I think 13 G or j ?? which was a earlier glorified 20B which came out with factory porting.

1 thing I am sure of is that I miss the late 70,s and 80s !!
Heaps less traffic , No speed camera,s and Less cops