Roger/Brian, I'd forgotten about the carbon under the metal plate and the bimetallic coil/ flap - when I took the top end of engine apart my inlet manifold was cracked and even the second hand one I got from SLJ had a lot of carbon under that plate. It took 6 cans of Mr Muscle aerosol oven cleaner, a powerful jet washer, assorted tooth brushes and bottle brushes to get it all clean again!
Logic would say it's all related, creating a hot spot under the carb.
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