Do you recall if you're running the stock main jet (and, is it clean)? (#125)
Did you check your float-heights to see if they were within specs, at any time?
Stock muffler or Z1 mod?
"Snorkel" is in place or removed?
Air-filter in place and clean?
We don't know yet if you're running rich or lean...but should know soon.
Cracks that are all the way through, on the carb-engine duct will cause the bike to run lean. Usually, they don't penetrate all the way though; you can test this by spraying something like WD-40 on the duct while the bike is running, and both listen for RPM changes and look for bubbling. Check all ring-clamps for leaks there too...
Last edited by alexd; 08/08/12 10:12 PM.