The pinking I experienced on the R69S wasn't improved by using high octane petrol (it seldom is from my experience), nor any liquid fuel additives. An older, wiser hand made me a present of the aforementioned diamond-shaped lead balls, complete with propaganda stating they were used in WW2 fighter planes, etc.
How could they possibly work? It's a scam, a gimmick for the gullible, there's no chemical reaction that takes place and so forth, we all know the drill. I dropped them in the petrol tank just to humour him before riding home. A few days later I realised that the tinkling sound, to which I'd been so accustomed, had all but disappeared. When I refilled the tank, it came back for a short while, before vanishing again once the…