09-03-2009, 07:30 AM
You can get fumes from an overly lean condition, NOX fumes. A lean condition could also cause the loss of power or lug. When the choke is closed raising vacuum through the venturi, more fuel is drawn.
You can let the engine idle with the choke off and take a folded towel and cover the top of the choke horn with the towel and your hand trying to shut off the air. If the engine raises RPM before shutting off, your mixture is lean. If it just sputters and shuts off, your mixture is rich.
Did you check the float level with the guage when you rebuilt it? It sounds like it may be too low.
You can let the engine idle with the choke off and take a folded towel and cover the top of the choke horn with the towel and your hand trying to shut off the air. If the engine raises RPM before shutting off, your mixture is lean. If it just sputters and shuts off, your mixture is rich.
Did you check the float level with the guage when you rebuilt it? It sounds like it may be too low.
'72 TBA...