Why should the G-4 be heavier than the G-2 (except a tiny bit from different radio, sturdier landing gear and larger tyres)? According to the info I have the take-off weight of a G-2 is around 3100kg, the same applies (to the little information I found in a quick search) to the G-4. I mean even the G-6 is only 50kg heavier than a G-2 ...
