Yes, that would work well as a diagnostic; it can be taken further by removing
the cold air intake and with a flat screw driver lift each carbi piston about
1/4 at a time and note the rpm drop; a larger rpm drop indicates a richer
mixture
on that carburettor, a lesser drop indicates a leaner mixture on that
carburettor
(on the bing units any rpm difference may indicate a worn main needle
or jet, or a manifold air leak)...same diagnostic test can be done at idle
too...
make sure the air balancing has been done first and both damper pots have
the correct oil level
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