My E50 is cutting out at high revs, it's definitely ignition as I can hear a pop on occasion. It has the standard points ignition and changing the plug hasn't made a difference. Ive disconnected the grounding wire to eliminate that and no difference. Guessing what's left are the HT coil, condenser and points so will start swapping them out. Just wondered if anyone had an idea what I should swap first, I'm thinking condense.... cheers!