What diameter spray bar did the B-40 come with?
For future reference, there is a pinned thread at the top of the engine list that has a chart that Randy Smith posted with basic venturi sizes and such. Other useful stuff in the little group of pinned threads that makes things easy to find. A simple search of that section of the forum turned up and confirmed the sizes. In this day and and, there really are no new problems, just different people having them!! Stunthanger has been around , what, 20 years or so now? There is just about anything that you might want to know that has already been asked and discussed several times. My memory ain't what it used to be, (I think!) and I use the search function all the time!!
Type at you later,
Dan McEntee