Hi all, i'm having a bit of trouble with my Yamaha XS 250 Custom 1980. It keeps on firing on one cylinder and i do not know why? I have changed the one ignition coil, the condenser, the pickups and set them to a measurement of 0.35mm but i'm still having trouble with it. Can someone please help me as this is the only problem i'm having that's stopping me from getting it on the road. Many thanks; Kyle