SCHMITT intake manifold or carburetor flange / adapter - Made in Germany. This adapter enables the installation of modern PHBG carburetors with 24mm clamping flange on Simson mopeds with M531, M541 or M571 engine, such as S50, S51, S53, S70, SR50, SR80, KR50/1, KR50/2 Schwalbe, Sperber, Habicht or Star. Produced on state-of-the-art 5-axis CNC milling machines in Germany, this intake manifold offers a perfect surface finish. The connection between carburetor and intake manifold is a perfect fit and without edges, steps or joints, which ensures optimum gas exchange. The milled Venturi cone accelerates the air-fuel mixture, which increases performance. The geometrically optimized carburettor flange enables a linear transition from the carburettor to the air filter heart box without the usual kinks. The scope of delivery includes two DIN 6912 hexagon socket screws and a matching silicone O-ring, which can be replaced by the standard flange gasket. Outer diameter: 24mm, venturi passage: 19mm to 21mm.