I have just bought myself a really nice 1986 C reg 2 door 900 sedan with only 42k on the clock and 1 owner. Can anyone confirm with me that this should be ok to run on unleaded petrol? It is just the basic carb model.

I used to run my A reg 900 GLs (twin carbs) on the seedless stuff. It was on 45K when I bought it and on 157K when I sold it, still purring along happily.

models from 85 onwards do officially run on 95RON unleaded, though I've run much earlier cars with no problems...