Hello! Our seat lawn mower can only be started from afar for a long time and I don’t know why… Technical data: Engine: Briggs & Stratton 7,8 kW, 4-stroke With electric starter and alternator If I want to start it I do the following: It also jumps directly and runs. Battery is okay, has 12V. I suspect that the mass connection is missing or loose (see red circle in the picture). However, I don’t know at all. It would be great if someone could help me! D anke