Hi Eddie, Yes the float bowl slowly fills up and fuel begins to pour from the two little overflow holes in the cap. Pulled them apart countless times and finally noticed that the needles had a distinct step in them. Rummaging through a bag of spares found a couple of other used needles with a better tip. BUT what became apparent was the material the old needles were made of was brass whilst the ones in the bag look like stainless! Lapped with autosol mixed with a miniscule amount of fine grinding paste, washed them out, then again with autosol only and they seem to have bedded in. I tested them by inverting the cap, placed the needle with float into it and blew as hard as possible . No leaks. Only when i took 9 bar of air pressure did it move! There was also some gunk which had grown or attached itself to the copper floats and I polished this off, hoping to get the floats to be more bouyant. Installed the whole shebang and no leaks at last. The MK4 fired up first time no throttle, no choke and full advance. Superb! Thanks Eddie. Wish you could have heard both cylinders firing at the same time finally and without standing in a pool of costly petrol. I even began to tweek the air screws which now made a difference. So onward we go, tweeking the carbs to remove the hesitancy when one opens the throttle, taking slack out of front brake cable which seems to be at the limit and when I pluck up courage tackle the jumping second gear. Thaks for your help