Prox idle sprayer for Keihin carburetor size 78

The Prox size 78 idle jet is a precision idle jet for Keihin carburetors, developed for motorcyclists seeking stable idle tuning and reliable cold starts. Manufactured to Mikuni standards, this part delivers consistent performance at low engine speeds and across varying temperatures.

• Type: Idle jet / idle jet for Keihin carburetors
• Size: 78
• Compatibility: Fits Keihin carburetors that require a 78 idle jet
• Material: Brass (brass-colored, durable construction)
• Brand/Quality: Mikuni — known for precise fuel metering and reliable performance
• MPN: JU-46.078
• Condition: New
• Installation: Easily replaced as a replacement part in existing Keihin carburetor systems

With this 78 idle jet, you can precisely tune the low-RPM fuel mixture, resulting in smoother idle behavior and better throttle response when riding away. It is a practical solution for tuning projects focused on low-RPM adjustment and reliability—such as cold starts, when the fuel mixture requires extra precision, or when adapting to varying riding conditions. By choosing Mikuni-quality components, you benefit from consistent fuel flow and long-lasting reliability, reducing the need for frequent maintenance and tuning.