Carburettor Issues (B30A/E with Dual Strombergs)
Symptoms
Rough idle, hesitation, stalling when cold, uneven running, black exhaust smoke, poor fuel economy.
Cause
The B30 uses two Stromberg carburettors that must be perfectly synchronised. Worn throttle shafts, clogged jets, perished diaphragms, or incorrect float levels will cause running problems. Ethanol fuel doesn't help, it rots old rubber components and varnishes the internals.
Fix
Full strip-down, ultrasonic clean, rebuild with a proper kit.
Replace all rubber components, set float heights correctly, synchronise the carbs with a flow meter or listening tube.
If the throttle shafts are sloppy, bush them or replace the carb bodies.
Some owners convert to Weber carbs or even Bosch D-Jetronic fuel injection from a later B20E for reliability, but originality suffers.
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