Some input on how the slide should work if you suspect a leak because of a hole or tear in the diaphragm.
YouTube - KEIHIN CVK carb - testing vac. slide function
This one is obviously a defective diaphragm and should be replaced, it should operate smoothly like in the first video or the video below...
YouTube - BAD 2005 Harley XL CV Carb Diaphragm
The slide should operate more like this one in the video...
YouTube - CV Carb vacuum slide test
YouTube - KEIHIN CVK carb - testing vac. slide function
This one is obviously a defective diaphragm and should be replaced, it should operate smoothly like in the first video or the video below...
YouTube - BAD 2005 Harley XL CV Carb Diaphragm
The slide should operate more like this one in the video...
YouTube - CV Carb vacuum slide test