2 Theyre not adjustable on your car, or at least unlikely to be. Screwing upwards weakens the mixture, downwards enriches it. Im looking for manual on the Stromberg 175 cd-2 for tuning and repair, there are tons of books for carbs but non on the Stromberg. Use a coin to turn the jet-adjusting screw one-eighth of a turn at a time, waiting each time for the engine speed to settle down. Stromberg 175 cd 2 manual Zenith stromberg 175 cd-2 manual.

Make sure that the jet remains centralised. Keep the jet central while you adjust the mixture by taking the damper rod out of the top of the carburettor and pushing a pencil or soft metal rod firmly down the hole to hold the jet in place. If the jet is central, the piston falls with a sharp click. Off the engine before adjusting the mixture, and check that the

If it rises and stays fast the mixture is too rich. 175 CD 2 was fitted to cope with the emissions regulations and was designed to be set-up at the factory and not tampered with by owners, so adjustment of the mixture is not possible. If the mixture is correct the engine speed should rise slightly for a moment, then return again to normal. (For removal and refitting instructions, Section A refers).

Listen to the engine note while you do so. Stromberg carburetter (Zenith type 175 CD-2S), to overhaul-Operation L1-3.