If you have even a small amount exhaust gasses by passing the correct flow through the exhaust system, it will lead to a loss of performance, and potential piston and valve damage.
So if this Packing is not in good shape, then it would be better to replace with new. After all, that will be just one thing less to worry about on your machine.
Add as many items as you like to your shopping cart and pay just one fixed price shipping cost. CMS is the supplier of choice for most enthusiasts when purchasing high quality spares and accessories for Japanese motorcycles.