Here's my contribution
This is around 1980 and my first Bike a 1974 Honda Elsinore MT 250 which was a 2 stroke with 2 spark plugs, one on top of the cylinder and one to the side for hot and cold plugs. The 2 mates I'm with and I are still in contact.
This is around 1989 with my 2 eldest sons Jeffery and Matthew, the youngest son Nathan was only a little new born at the time. He was Married last weekend. The bike is a 1981 Honda XL500s. I wish I had this bike today, I just loved it.
This is a photo of my Dad on his Ariel. As I was growing up we were always told it was an Ariel Four Square, but clearly it isn't, it looks like a Red Hunter from I'd say some time in the 1940's. The photo is pre Mum and Dads wedding so around 1950/51.