What are all those "N"s? It's really hard to figure out what you're trying to say but I did get that there's two tubes. The supply tube starts inside the air cleaner housing because the heated air is going to end up in the engine. From the air cleaner, it goes down to the exhaust manifold where the air gets heated, then the tube continues up to the choke spring housing. Engine vacuum draws that air, now heated, across the thermostatic spring. As that spring warms up, it uncoils and the end pulls the linkage to pull the choke blade open.
When there's a break in the tube between the exhaust manifold and the choke spring housing, the air drawn in won't be heated, the choke won't open, and the carburetor will stay on fast idle.
Sunday, October 2nd, 2011 AT 8:40 PM