went on the usual Eastside weekly coffee meet last night and we went down the hill at coogee going towards maroubra. while I was going down hill I left the bike in 3rd gear and took my hands of the bars to stretch a little while the bike rolls down the hill smoothly. However - I kept hearing the pipes backfiring rapidly - not quite a *BANG BANG* backfire but a *I sound like a drag car gearing down* backfire. plop ploploplop ploplop ploplop - yeah you get the idea. it happened a few times but last night it was louder than usual.... or maybe cos I was riding with my visor up so I could hear everything. mind you - my baffles are completely out and the back plate went with it so my pipes are pretty much hollow at the tip. it this the sound of the bike asking you to re-jet it? or is it time to change my oil? or prolly both? or is it telling me that it's about to fall apart?