The rivet (also known as Stumble Pipe) caters for a better depression. The metallic sealing between the carburetor housing and the cover avoids the adhesion of the partition on the cover even if this has already been expanded. Due to the components of the petrol the rubber-material - which can wear out - changes. Additionally the clip of the secondary pin was assessed slender at one pitch and the primary pin was assessed richer at one pitch.