Scooterotica

never seen it before ,condensation on outside of carb after a few miles ,whats the cause ?
cheers john

To show the carb is working properly.
As fuel is drawn through the atomiser and carburettor, a certain amount will evaporate (the rest remaining tiny droplets).
The change of state from liquid to gas requires quite a bit of heat energy. This comes from, among other places, the carb body. As the carb will now be cooler, any humidity around will condense into water droplets. Et viola!
You see this loads on calor gas cylinders, same thing - liquid changing to gas.
I'm sure someone will come along and get all that into far fewer words.

Do you remember that lesson at school on latent heat, and you didn't understand it?

Well, you do now.

If the evaporating fuel cools the damp air too much, ice crystals can form and block jets. I had a Kawasaki that on mornings with frost and fog would struggle to run after 20 miles or so. Carbs on later models were fitted with little electric heaters to stop it happening.

Knowledge wrote:Do you remember that lesson at school on latent heat, and you didn't understand it?

Well, you do now.

you cant tell me you can remember that far back martin