The following problem has occupied me for days: I changed the cylinder head on my XS650 and reassembled the thing properly. Now the part doesn’t start. Except two or three loud false ignitions on both cylinders – real shots – nothing happens. I have set both valves and ignition. However, I have to say the following: when setting the interrupter for the left cylinder, I’m not sure if I’m the right point for the When does this take place? 180 degrees after the opening of the interrupter for the right cylinder? At the setting ignition for left cylinder, the test lamp lights up too early if the marking is about one centimetre to the left of the early ignition marking. This cannot be changed, even by turning the disc. I suspect that I am making some fundamental mistake, and I would be very grateful if someone would give me a Before the cylinder head installation everything worked normal. I disassembled the ignition plate into the individual parts to clean it and replace the screws. Thanks Peter