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Carburetor Volvo Amazon SUHS6 (B18B/D) (3-Bolt)

Rough idle, poor synchronization between the front and rear carburetor, and a messy excess of fuel are among the most common symptoms of a worn SU HS6. On the twin-carburetor B18B/D engines, the condition of the metering needle and needle valve governs how cleanly the engine runs at cold start and idle, and worn springs or levers make throttle response feel uneven.

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This category gathers spare parts for HS6 carburettors with a 3-bolt flange. The group includes metering needles, needle valves, springs and spring washers, screws and washers, as well as levers and retainers. During an overhaul, the needle valve and metering needle are typical check points – a sticking needle valve causes over-richness, while a worn needle disturbs the mixture.

Since the 3-bolt flange and HS6 design differ from other SU variants, it is important to match the correct part to your carburetor before replacing any parts.

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