[timcosby]

An air leak before the carburetor, such as in the intake tube, will potentially cause a lean condition if enough air gets in. That won't directly affect the idle speed, but can cause a bike to get hung up or idle at a higher RPM. If plugging that hole doesn't change anything, then that makes my first two questions relevant.[/QUOTE]

air leak befor carb will only get you unfiltered air not a lean condition. air leak after card in between enginr and carb will cause lean condition.