No pictures, but this afternoon I've drilled out the size 20 pilot jet in the Huntmaster's MK1 Concentric carburettor.
It's now got a size 30 pilot fitted, which reflects the size 35 specified for the BSA Road Rocket (fitted with a Monobloc) and the fact that Concentrics are supposed to run richer than Monoblocs...
Time for a road test.

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