Most likely is what @SimonBrown says in above post. Hot spot due to poor injector spray pattern. Black puff is the 200's excess fuel start system working, good for getting dirty looks at the supermarket car park. :D

Nice bit of history.

The wife was just looking through some old pics and came across this. These were both mine, 93 94 or there abouts. The 110 on the left I think is dead now but hoping someone still has the series 3 as its sorn. And just over the shoulder of the...