Interesting minor problem today on the exhaust front. After filling up with petrol I fired up (literally !) the ST4S and got one beauty of a backfire - other customers must have thought Al Quaeda were in town. Riding off from the filling station there was a hell of a racket, as if there was a hole in the exhaust. The backfire had blown the pipes apart at the swivel connector under the engine and they were out of alignment. Easy enough to put back together, but it looks like the problem stems from the bolts connecting the silencers to the pannier frame, which allows quite a bit of play and you can wiggle the silencers around, which must loosen the swivel joint over time, even with the retaining spring.

Anyone else had a similr problem ?