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The carbs need to be gone through, cleaned, checked, and adjusted.
That does look odd to me. Damaged diaphragms seem like a good possibility, but there are internal carb issues that could cause that as well. Dirty jets or restricted passages can do it.
It should still run and idle halfway decent (when warm without the choke) with the airbox off - if everything else is right.
I would still double-check the valve adjustments and confirm the can chain is snug.
Do we want to move this to the Tech Section?
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