Unlike other types of carburettor , which have fixed jets , the SU has only one jet, so the mixture setting affects the engine throughout its speed range. Some SUs also have exhaust emission-control devices to comply with anti-pollution laws. Adjustment of these is described in Adjusting an emission-control carburettor. Before tuning the carburettor, carry out all the checks in Checking and cleaning an SU carburettor , and bring the engine up to normal working temperature. Also check the level of oil in the dashpot - the domed piston chamber at the top of the carburettor.
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How to tune my carburettors : MG Midget Forum : MG Experience Forums : The MG Experience
Having trouble posting or changing forum settings? The MG Experience www. Page 1 2 3. How to tune my carburettors 1. Hello everyone! So after the huge success with the timing the car drove like a dream on a "parade lap" I did around town, I felt at the top of the world, so now being aware of my newly acquired mechanical skills I decided to give a go tuning my carbs, I mean how hard can it be? Well the answer was "biblically hard".
Adjusting an SU carburettor
Twin carburettors have an unjustified reputation for being hard to keep in tune. This is not clever regardless of whether you have one carburettor or several — the carb s should always be the LAST thing to adjust. As the problem was probably somewhere else, the tuning attempts are invariably doomed to failure and the engine finishes the exercise no better off than it started. Twin carburettors ARE hard to tune!!! The actual tuning procedure is quite simple: First, check that everything else is to spec see above — it is a complete waste of time trying to tune out a fault elsewhere by adjusting the carburettors.
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