HJ390-4 Mikuni hex head main jets 4/042, size 390

These EBC Mikuni hex head main jets are an essential part of any carburetor tuning kit. Manufactured by A-BAX Precision Engineering, these size 390 jets are built to the 4/042 specification, offering the precision required for accurate fuel delivery. They are designed to fit Mikuni VM series, VM-18, VM24-512, VM26-606, and TMX carburetors. When you are pushing for more power, ensuring your main jet can supply enough fuel is vital for engine longevity and performance. These brass jets are machined for a perfect fit every time, helping you avoid the headaches of inconsistent fueling. They are sold as a pack of four, making them a practical choice for the professional workshop or the home garage.