I should have been more specific.there are a few pipes.

MK2,At the rear of the Head there is a small grey pipe around 10ml in diameter and 15 inch long,I think it maybe part of the coolant system,does it fit on the carb? there is another similar pipe about 15ml that comes of the right hand side of the head that goes to the carb.

I am not a mechanic,

Thanks

Capt

the big pipe comes from the bottom of the rad on the right side, the smaller pipe (cotton wraped ) one comes from the top bach of head to the carb bottom left ( under the big one ) they are to gether like a v on the carb, hope this helps thats what they are like on my mk2

cheak your coolent levels,

+1. I think you have disconnected a coolant pipe that is actually a 'carb heating pipe'. Fitted to stop icing up in the carb, but pretty much redundant in the UK. goes from the top of the head into the carb and then back to the bottom of the RHS radiator.

thanks for this.
Fixed now,very lucky it was raining when I got back that day ,so I did not notice that it had spilled all the coolant overnight.

Could have killed my engine.