Carburettor tuning complete set for Hercules P3 Optima 85/12 13 mm Sachs Prima 2 3 4 5 GT Sachs 504 505. Perfect for tuning cylinders or generally for tuning. New tuning carburettor complete kit of the type such as Bing 85/12 but with larger 13 mm opening. 85/12 carburettor for Sachs 504 & 505 series engines. This is a Bing replica carburettor for more performance. The carburettor can also be used on various models as a tuning carburettor. For example, Hercules Prima 2 / 3 / 4 & DKW. The carburettor is delivered coordinated and is therefore ready to install. Main nozzle: 50 carburettors in top quality, the carburettor is completely ready to install and comes as shown in the picture including the gas guide pipe. This type of carburettor was installed as a series carburettor with only 10 mm passage, among other things on the Sachs 504 and 505 engines such as Hercules Prima, KTM, DKW as well as partly on the Sachs 506 engines of the Prima GT GX Prima Presto SM 25 etc. With the Optima, this carburettor was installed as standard. This carburettor is suitable for the Sachs 504 and 505 engines, without adapter/spacer, as original.