Hi, eventually resolved problem with 89/90 RC; duff pick up coil/harness. Resistance all good and insulation when measured; not good when tried to use! I also stripped down carbs when she refused to start and found broken mixture screw which I thought was the cause of rich running; replaced with help of Zac who has given much support. At the same time I stripped the carbs and found that the original EV27 carb had been replaced with an EV 30 and With the larger jets for for that carb. I would like to replace those with the correct 2 x 140 main jets and 46 Pilot jet to see if that reduces the rich running and bring the mixture screw back into play; it is fully seated and the bike runs ok with slightly sooty exhaust, however it does run! Bob Wright is checking his stock of jets as I type but if any one has any sparesI’d be happy to part with silver ( or Plastic).