ZUNDAPP BELLA PETROL CAP Home › Forums › German Motorcycles › Zundapp › ZUNDAPP BELLA PETROL CAP Viewing 1 post (of 1 total) Author Posts 2011-05-11 at 12:17 pm #12339 howardbellaParticipant ZUNDAPP BELLA SCOOTER. Can anyone describe how a petrol cap should be assembled. An exploded diagram would be even more helpful. Thanks in anticipation. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.