[QUOTE=Roelof;15416321 The offset carb is a solution to get the intake hole of the crankshaft in line with the crankpin which should give more balance in the crankshaft. [/QUOTE]

Not really. Wrong assumption. Offset carb was done to have better line up intake pass, balancing I can solve much easier.
Unfortunately I quite this beautiful hobby, I was in since 1975 till 2007. Now for 12 years I have different hobby.