A. This is a mechanical carburetor designed to be compatible with specific vehicle models. It can provide precise fuel supply for vehicles such as TECUMSEH 640004, 640014, 640025 A B C OHH50, 55, 60, 65 and so on. In terms of design, it is carefully crafted to ensure a perfect match with these compatible models and support the stable operation of the vehicle. B. In terms of use, it plays an important role in vehicle performance. It can achieve good adjustment functions during idling and acceleration. Although the specific idling and acceleration data need to be consulted with professionals, its design goal is to enable the vehicle to achieve ideal operating effects under different driving conditions. Meanwhile, regarding fuel consumption per 100 kilometers, although the specific value also needs to be consulted with professionals, the reasonable design helps to achieve more economical fuel consumption. C. Detailed information such as the size of the mounting holes, the structure, and the matching engine model can be obtained by consulting the shop owner. Professional after - sales support can give you more confidence during use and ensure that this carburetor can bring performance improvement to your beloved car.