13-05-2019, 01:33 PM
Hello again Mick
Just re-reading your posts again, do I understand it that your problems show themselves with the SU, a Zenith and another Zenith ?
It would seem to me that if this is the case it's extremely unlikely that all 3 carbs are faulty.
I'd be inclined to look elsewhere. For example any kind of misfire or weak spark under load will also tend to soot up plugs even with a correct mixture. If your engine isn't fully run in it could also be burning a little oil (not enough to give tailpipe smoke). This also promotes plug fouling unless you can get their insulator tips hot enough to burn off the deposits, which will only happen on a decent fast run. Idling and pootling around (especially in cool weather) don't seem to be enough in my experience.
Cheers John
Just re-reading your posts again, do I understand it that your problems show themselves with the SU, a Zenith and another Zenith ?
It would seem to me that if this is the case it's extremely unlikely that all 3 carbs are faulty.
I'd be inclined to look elsewhere. For example any kind of misfire or weak spark under load will also tend to soot up plugs even with a correct mixture. If your engine isn't fully run in it could also be burning a little oil (not enough to give tailpipe smoke). This also promotes plug fouling unless you can get their insulator tips hot enough to burn off the deposits, which will only happen on a decent fast run. Idling and pootling around (especially in cool weather) don't seem to be enough in my experience.
Cheers John