I have updates ...... the damn thing is FIXED !!!!!! 🤗🤗 I ordered 3 things last week. A magnetic pick-up sensor with wire & plug only in Poland, a rotor in UK and a back plate with sensor and wire complete in Holland. The Polish magnetic sensor & wire only arrived yesterday and I was ready to take hammer & chisel to the blob only to find it crumbled at the lightest touch. Some dick had 'glued' the sensor on with window putty or badly mixed epoxy. Clean up, install new sensor, lead wire and plug behind the heat shield to the other side of the bike and plug into the loom. The bike ran smooth today and stationary at traffic lights quietly rumbles on tick over, no drama. I treated her to an oil change and a chain lube just now and all is good in Yamaha FJ1200 world. Thanks for bearing with me, your suggestions and commiserations 👏