Prox main jet for Mikuni Carburetor size 390

The Prox main jet for Mikuni carburetors size 390 is a precision component for anyone looking to finely tune their engine's fuel-air mixture. Suitable for riders who rely on Mikuni carburetors and need reliable performance across a wide range of riding conditions.

• Type: Main jet for Mikuni carburetors
• Size: 390
• Material: Brass, CNC-machined for accuracy and durability
• Brand/Quality: Prox quality with Mikuni compatibility
• MPN: JU-47.390

This main jet replaces worn or incorrect jets and enables precise adjustment that is essential for optimal acceleration, stable idle speed, and efficient fuel consumption. With its precise 390 size, it delivers balanced jet flow across a wide RPM range, eliminating inconsistent throttle response and allowing the engine to run smoothly across varying air and atmospheric conditions. Ideal for off-road and race applications where Mikuni carburetors form the foundation for reliability and consistent performance. A sturdy brass construction ensures long service life and reliable fuel flow, meaning maintenance and tuning sessions are required less frequently.