15 replies to this topic

[amr27]

As above. Thanks

[charie t]

working ones

[ACDodd]

Is it standard or modified? What age is the engine?

 

AC

[Gremlin]

working ones

Don't be silly, ones with a small gap.

[Gremlin]

In the near future, lasers :)))))

[KernowCooper]

Standard Engine BPR6ES or Champion RN9Ys will be ok, some say the NGKs are better I've used both without issues

[Tamworthbay]

Standard Engine BPR6ES or Champion RN9Ys will be ok, some say the NGKs are better I've used both without issues

As Dave says both of those should be ok but bear in mind that although they are the same in theory, in practice cars can prefer one or other due to small differences in the plugs. My Mini likes NGK better than Champion but my daily drive MGB GT will ONLY run on champion plugs. If I put NGK in it fouls them within a week and won't run. The point being, find ones that work for you and stick with them.

[amr27]

My engine has a highlift cam, lcb manifold, k&N air filter, stage 3 head, lightened clutch and fly wheel. And it's 1992 A series. Can't seem to get it to run right on the NGK BP6ES but haven't tried any other plugs. It seems to go worse when it gets up to running temperature

[Tamworthbay]

Have you had it on a rolling road? Could be any number of issues apart from the plugs.

[amr27]

I've checked all other possible things that I could think of and this is what I've came down too. No haven't had It on a rolling road, in from Northern Ireland and don't know of anyone who has a rolling road that knows a lot about minis.

[dklawson]

Elaborate a bit on how the engine is not "running right" and tell us what the plugs look like when you remove and inspect them.

[amr27]

Elaborate a bit on how the engine is not "running right" and tell us what the plugs look like when you remove and inspect them.

The plugs are light brown, with an AAU needle in it, It Boggs down and miss fires as soon as you hit the accelerator or when the cam starts to kick in. And This happens once the engine starts to warm up. I've fiddled quite a bit with the carb to try and sort it but it hasn't made any difference, also changed the coil. There's an electronic ignition on it could that possibly cause the problem?

[ACDodd]

The plugs mentioned should be fine. The problem you most likley have is the needle choice. Get it on a rolling road and get the fueling dialled in. The AAU will likely be way off for this spec.

AC

[amr27]

The plugs mentioned should be fine. The problem you most likley have is the needle choice. Get it on a rolling road and get the fueling dialled in. The AAU will likely be way off for this spec.
AC

Thanks, I tried the AAA needle in it and the lowest CO reading we could get was 7% with the adjusting nutt screwed all the way to the top?

[Gremlin]

Is the jet in the carburettor worn, and at what revs did you take that reading