VM/TM/TMX Series Hex Main Jet, Size 170

The Mikuni 4/042-170 is a genuine Mikuni large hex main jet, specifically sized at 170 for fine-tuning Mikuni VM, TM, and TMX carburetors. This brass jet measures 11.5 mm in total length with a 5.2 mm thread diameter and a 5.25 x 0.9 thread pitch, ensuring precise fuel mixture control for optimal engine performance. These main jets are crucial components for carburetor tuning, allowing users to adjust the fuel-air mixture to match engine modifications, altitude changes, or specific riding conditions. Mikuni offers a wide range of jet sizes, from 50 to 720, to accommodate various tuning needs. This particular jet is essential for achieving the correct fuel delivery in compatible Mikuni carburetor systems. The Mikuni 4/042-170 is sold as a pair and includes no instructions. Buyers are advised to verify the dimensions of their existing jet to ensure compatibility, as Mikuni's fitment guides may not always be 100% accurate due to various factors. If unsure, it is recommended to consult with a professional or provide a picture of the removed jet for identification assistance.