I am not sure if a specific passage was open, but we did make sure all the passages were open and no blockages. However, the rest of your reply is very interesting. i.e., there is a plastic nipple that takes air from the side of the carb to the opposite end from the diaphragm. Could that be the passage that your referring to? In a few minutes I will go out and bring the engine inside so I can get the product number off it, and I can share it with everyone. Maybe take a photo and upload it .Thanks a million for taking the time to reply.
Ken McCormack
I ment after the i.e., there is a plastic nipple that goes from the phenolic spacer (reed cover) to the opposite end of the diaphragm. How can I download three (3) photos of this carb/engine? I'm not very computer literate. Thanks, Ken McCormack