Hello,

I have the above Mini Copper which is fitted with NGK BPR6ES spark plugs and running on unleaded 95 petrol. I am looking to get a new set of plugs so I removed one of the plugs the other day which seems a little lean to me (see the attached photo), however maybe this is all correct for this Mini - also, are the NGK BPR6ES plugs correct for this model and if so, what gap should they have? Cheers

BPR6ES are the correct plugs and the gap should be the standard 35 thou.
I would suggest 98 unleaded
The plug does look a little lean but you did not say whether it is a carb or injection.

_________________
Cheers Dave.

Injected I reckon, doesn't sound like it would have been converted to carb..

If it's just one of the plugs then I'd be thinking about a leak down test, those white deposits could be oil. Try a hotter plug - BPR5ES

_________________
did I tell you that I won a trophy?

Thanks for the info. I'll try a new set of BPR6ES with a gap of 35 thou which is .889mm and see how she goes and I'll also try running on 98 unleaded as well, cheers

Check your other plugs. It's not that uncommon for 2 cylinders to run leaner than the other two on an injected mini - particularly on early models and on later cars if the inlet manifold was replaced with an earlier design one, or incorrectly 'performance modified'.