Nearing the end of a 50 mile good run on my '55 ES2 with it running very well it suddenly started spluttering and coughing. I pulled over to find fuel peeing out of the Amal Monobloc from - it appeared - the float chamber. "Ah!" I thought, "Needle valve/float problem!" I removed the float chamber end cap, float and needle valve, flushed the inlet through with a quick opening of the tap, wiped everything clean and reassembled. No difference. I repeated the exercise but this time removed the whole inlet valve assembly, again blowing through and checking that the needle valve closed OK. All fine. It was as I was reassembling it once more that I notice the main jet block retaining nut at the base of the carb seemed to move. On checking I found it to be finger tight. Tightened it up, reassembled every thing, prob solved.
I'm telling this story as it may save someone else from dismantling everything unnecessarily. I should have twigged that the reasons the fuel was running from the base of the float chamber was 'cos the bike was leaning on its side stand with the fuel running to the lowest point and anyway, the float chamber is usually fuel tight. Doh!
BTW - does anyone know the correct torque for that retaining nut?
I doubt if even Amal ever…
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The washers seem to settle …
The washers seem to settle ,mine leaks from the same issue several times a year, or perhaps its vibration.
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Correct torque
Friend of mine 56 years ago asked about carb flange nuts torque for his 1927 Rolls.
Factory answered: Use a six inch spanner and mechanical discretion.
Guess same applies for your nut.
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I doubt if even Amal ever used a torque wrench on their carbs. But don't overdo it, or it will stick fast. There's a rubber(?) gasket in there so it should seal quite easily.