Good morning together, drive a KTM 690 SM year 2009 with original exhaust. Before about 500km I noticed that the exhaust pops when I take away the gas from higher speeds (e.g. at 5000/U in the second gear gas away). The banging was isolated, it was always only 1-2x banging in a row then was calm. Banging is actually also the wrong word here, it is not very loud but you notice it also with closed visor clearly. Since about 200km the exhaust now always pops more, i.e. also from lower speeds, when I take the gas away, it starts to bollard immediately (smiling, bragging, whatever you might call it) and I generally feel that the exhaust is very loud after about 50km when it is really hot. People are already turning around inside, that was never the case before. I am thinking a little bit about the cause and effect. Oil level in the display glass is exactly centered, as described in the manual. – Motorbike runs too fat (carburettor set wrong) – Exhaust has too little insulation wool – Exhaust is leaking What effects does the bang have on the motorcycle or is it completely harmless? Besides oil change and chain service, I have never done anything on the motorcycle, so I don’t know well, so what would be advisable if one of the above points were to apply? Rather go to the dealer or hire yourself? Thanks and greeting Montana