In addition to the intricately crafted components, the carburetor assembly in the M40 engine includes several purchased parts that play essential roles in its functionality. Retaining screws secure the various components together, ensuring a stable and reliable assembly. The air bleed screw allows for fine adjustments to the air-fuel mixture, optimizing engine performance under varying operating conditions. A carefully selected spring provides necessary tension and smooth operation for certain moving parts within the carburetor. Lastly, the o-ring acts as a crucial seal, preventing any unwanted leaks and ensuring the carburetor’s airtightness and proper function. The incorporation of these purchased parts enhances the carburetor assembly’s overall efficiency and reliability, reinforcing the M40 engine’s commitment to delivering consistent and high-performance results.