Author Topic: A10 Monobloc pilot jet  (Read 400 times)

Offline Catz

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A10 Monobloc pilot jet
« on: 02.03. 2023 12:14 »
Yet another question. Im trying to determine the size of the pilot jet for the A10 with Monobloc carb.
No mention of the size of the pilot jet as far as i can tell in the Haynes. I've got two sets of carbs and the pilot jets that came out of the two are obviously different in size but are both marked up as 30. One is stamped and the other etched, hope the pictures show up. The other concern is the size of the holes down the middle of each jet and the bleed holes, both different.
What is the standard size pilot jet for the Monobloc? Everything else in the carb i intend using has standard settings. Thanks in advance.
Crewe, Cheshire, England 1960 A10

Online groily

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Re: A10 Monobloc pilot jet
« Reply #1 on: 02.03. 2023 13:02 »
https://draganfly.co.uk/bsa-carburetter-jet-settings/h
Depends what Monobloc you have, 376 or 389. 
Obviously need the right slide and other bits for it all to work in harmony.
Check pilot air feed (from where the jet screws in to carb bore) is clear - a squirt of something up the hole will usually show you.
If in doubt on sizing and markings on what you have, a new one isn't expensive  . . .
Bill

Offline Catz

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Re: A10 Monobloc pilot jet
« Reply #2 on: 02.03. 2023 14:59 »
Thanks Groily,
i've got 2 sets of 389's and it looks like Billy and Johnny from the pub could have re-drilled the jets so to be on the safe side i've just ordered some new jets and gaskets direct from Amal.
30 quid posted for a 240 and 250 main, a 30 pilot and the gasket set. Not bad i think.
Crewe, Cheshire, England 1960 A10