I finally have sussed what was wrong with the Amal 276 on the BSA: The float was set too high (mind you, straight from the maker, but that’s not much of an excuse). Imagine my excitement when I kicked the machine to life and it idled, stone cold–which it has never done. The carb was absolutely full of crud, too, which I suspect is the remains of the old cork fuel taps. (I’ll check it again in a couple hundred miles, but the tank itself was sealed when it was restored.)
Alas. Back from a short “victory” ride, I discovered I was leaving a trail of oil. The photo above shows why: the return line from the cylinder head decided enough was enough.
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