Aaaah! The Tiger Cub! Had one of those, and an AJS 250, and an Excellsior. The last had an odd-sized engine (for the period), can't quite remember, but it was something like 135 or 127cc. I do remember coming off it on a number of occassions, mainly as I hadn't bolted the tank back in place at the front. Everytime I went around a tight turn on a dirt track, the tank would move! That meant my knees would move with it, balance shifted, bike shifted, and I shifted - into the sh*te!!!