Before replacing the k/s lever, make a couple checks. First, look at the mounting plates and rubbers on the silencers. Also, look at the big aluminum plates. The big plates may not be mounted to the frame properly, causing the mufflers to be mispositioned. Measure the spacers. If they are ok, then the rubber mounts can be shimmed with washers to move the exhaust in or out. (Loosen the head nuts if needed.) Make sure the exhaust is not binding on something solid after shimming (swingarm etc) K/s lever: These tend to be loose, from improper installation (and poor design?) If used when even a little bit loose, they will cause some wear inside the clamp. First, check for a gap between the ends when the clamp bolt is torqed. Use a feeler gauge, and flashlite. If no gap, you must remove material from one or both sides so it will pull tighter. Also, sometimes the bolt body itself is what is binding up, instead of the clamp pulling tight. That special bolt can be a big problem in this case, and it may have to be carefully ground down for necessary clearance inside the clamp and still work correctly. (Helps to have a spare bolt on hand for reference/replacement!)
Also, look at the foot lever itself. Check for excessive movement in the pivot. If sloppy, it could move sideways enough to touch the exhaust when kicking. Also, does contact occure when the clutch is in? If not, what is moving under load?
Something else to look at: Your pipe may not have the right bend(s) in it. I found a couple of pipes on Nortons I was uncrating/setting up that were not made properly.