Come to think of it GB I really cannot remember if I opened up one side at a time,or both at once. Remember turning on the fuel,then pumping the Amal ticklers till fuel ran down the side of both carb's,then pushing the handle bar mounted choke on to some degree,leaning the bike over to the left,and giving her a big kick.Back in those days I was a drinker,and it could be real interesting trying to kick start Nora with a full load of beer.Stupid stupid kid, amazing I lived through those times!!! Al