on these carbs was a jet kit ever installed at any time, then removed and reverted back to stock jetting?
If you've got free and clear, easy access to carbs...remove the tops and compare length of L&R return springs....also holes drilled in base of both slides.
Give me a measured length of springs.... and a diameter measurement of the holes (using butt of drill bits to gauge)
I'll compare the values to stuff I've got here. Just to eliminate weird variables.
Though I recognize this doesn't necessarily explain the immediate failure occurring within your ride.
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