On the bottom rear of the Jardine Roadster exhaust there are two pop rivets that hold the internal baffle in place. This baffle is wrapped in a high temp fiberglass mesh at the factory. The rivets on the left one were loose and I could move them with my fingers. I drilled both rivet heads off the left baffle, drove the rivets out with a small punch, and the metal baffle slid right out. the fiberglass mesh was 90% gone and the metal baffle was vibrating against the pipe wall, that is what was causing the rattle noise. I purchased a generic motorcycle exhaust repack kit, re-wrapped and wire tied the baffle with new high temp fiberglass mesh, and re-riveted it back in place with new pop rivets. The exhaust repack kit had new fiberglass mesh for both sides, so even though the right side was not lose and rattling, I drilled the rivets and removed that baffle too. It was really stuck in there, however when removed, the glass on the right side exhaust was in worse shape than the one on the left.
Once both sides were re-wrapped and wire tied, and it was all riveted back together, I could really tell a difference in the sound of the exhaust, and although it did not run poorly before, the bike seemed to run better with the repacked exhaust. Perhaps the blown out exhaust baffle wrapping lessened the back pressure, but either way the rattle is gone, the bike is running strong, and I am very happy with the result.