G'Day Frances, well of course your wise neighbour was quite correct in this assumption, whereas a 750 was a real big bike back in 1973 and quite suitable for carriage of twin-testicled men like myself, nowadays a 750 is classed as a "mid range" bike, and ultimately, more suited for the ladies. Don't even get me started on smaller bikes, I've never personally been able to justify their existance, except perhaps for children to learn on before moving up to 750cc and larger bikes, depending of course, on their gender.
I'm currently building a twin CB750 engined bike, as I think that this option would be accepted by my manly peers, and would be something of a novel talking point. Considering how heavy and unweildy this device will be by the time I have added a "Barn Door" fairing and saddle bags, king and kween seat, highway pegs, sissy bar etc, I'm hopeful that it will be seen as more than just the sum of it's parts, i.e., two "girly" 750's strapped into a modified frame and hidden by a mountain of fibreglass, but rather, a "real mans bike", as my finances don't currently run to Harley ownership.
Did your erudite neighbour also mention that while it's more than acceptable for girls to work on their own bikes, there are certain protocols that must be observed when practising these mechanical operations, or indeed just washing your motorcycle? I've been studying an old copy of "Hustler" magazine that I found in a public toilet in my local gas station, and it appears that you should in fact be clothed in an old pair of cut-off denim shorts and a cut down T shirt, and 9 inch stilletto heels?
While the first two items seem suitable in your summer climate, I'd recommend more comfortable footwear when test riding your bike, perhaps some colorful "flip flops"? I hope this helps, Cheers, Terry.