I have searched the forum and can’t seem to find an answer to my question. My 2009 BMW F800ST is making a deep popping noise at random times while riding. I can’t really determine where it is coming from and I can’t get it to do it while parked. The bike only has about 3400 miles and is basically brand new. I’m pretty mechanically inclined and this is driving me nuts. Here are a few things I have noted: • It does not seem to matter if it is hot or not. • Bouncing on the suspension or bumps while riding seems to make no difference. • Completely random when it occurs. • I have checked everything I could for tightness, as far as bolts, connections and hoses. • It only happens every so often, so I don’t think I’m going to bring it in to the dealer yet. • No warning lights on. • Bike is running great. • It does not appear to be coming from the exhaust. I may be hearing it come from under the seat, but it is hard to tell when riding. It sounds like it is coming from all directions. Maybe vacuum related? Has anyone else experienced this on any of the F 800’s ? I will take any info you have. I’m stumped.