On my arrival there was a very strong smell of petrol, which turned out to be coming from the front float chamber mounting point. This joint had always been damp when running, but never actually dripped fuel. When I tried to tighten it up the float chamber came off in my hand (honest Guv, it did). The thread in the body was stripped.
Luckily we found a box of carb bits and there was the right body in there. I fitted my existing dashpot and piston and float chamber, swapped the carb over, and it was running again. We went for a short run and I was amazed that the misfire didn't happen at all.
The run home was misfire free too.
Today we had a run with the Tees Valley MG Owners Club to Harlow Carr Gardens, near Harrogate.
We met at Yarm Station and had a pleasant drive down some lovely roads in blazing sunshine. We took a short coffee/ice cream stop in Masham, and arrived at Harlow Carr just after 12. No misfires at all up to now.
Harlow Carr is a beautiful place with plenty to see. We picniced and strolled around until, about 4, then set off for home.
Once again the misfire was noticeable by its absence. Dare I call it fixed? Why should changing the carb body make any difference? I can see nothing wrong with the old one apart from the stripped threads.