Ideal main nozzle set for tuning the carburetor. We supply 10 main nozzles inexpensively as a set. In the set, these nozzles are much cheaper than when buying individually! Suitable for many models with Gy6 engine or engines with Bing carburetor. Thread size: M4The following sizes are included in the set: 50, 55, 60, 65, 70, 75, 80, 85, 90, 95Our tip: Start with a relatively large main nozzle. If the engine is stuttering, you dust down until the engine runs smoothly. Thus, you prevent cylinder damage by sneezing the mixture! Please make sure before purchasing whether your carburetor M4 has installed nozzles. Comparison numbers: Neu & Originalverpackt.