Aye up
When I were a lad used to go down local pit on a old Honda 90 without exhaust made bubbly popping sound hence calling them bubble machines..
When taking foot of pedal or going down hills with no throttle get the same old popping sound from exhaust of my series 3..
Exhaust seems ok no obvious leaks or loose bits and rides ok apart from this does anyone know what could be causing this?
Thanks