Good Morning, I am Peter, sizzling in South Australia today. 41degrees Celsius. Probably too hot in the shed. I own a CB 250 K4, 1973 which was not running when I recently bought it. It is now but I have to get hold of a vacuum gauge to fine tune it. The carbs were in a bad way. Blocked jets and pinholes floats, split rubber diaphragms, general stuff. I was going to customise the little bike but it’s so original I will leave it as is. I’m enjoying the web site and learning some stuff, many thanks to all contributors.