The Idle Jet Orifice Screw Plug 317501 is an OEM component designed for OMC, Johnson and Evinrude outboard carburetors. This screw plug seals the idle jet (idle orifice) passage, helping ensure proper fuel metering for smooth idle quality, crisp throttle response, and dependable engine performance.
Although small, the idle circuit is one of the most important systems in a carburetor. It controls fuel delivery during starting, idling, and low-speed operation. A damaged, loose, or missing idle jet screw plug can lead to air leaks, poor idle quality, difficult starting, hesitation, and inconsistent low-speed performance.
During carburetor rebuilds or routine maintenance, the orifice screw plug can become worn, corroded, stripped, or misplaced. Replacing it helps restore proper sealing and ensures the idle circuit functions as intended.
At Liquid Revolutions, we’ve rebuilt countless Johnson and Evinrude carburetors, and we’ve found that replacing the small service components during a rebuild often makes the difference between an engine that simply runs and one that runs properly.
Key Features & Benefits
- Seals the Idle Jet (Idle Orifice) Passage – Maintains proper idle circuit operation
- Supports Accurate Fuel Metering – Helps deliver the correct fuel mixture at idle and low RPM
- Improves Idle Quality – Helps promote smooth idle and crisp throttle response
- Precision Replacement Part – Manufactured for proper fit and function
- Direct OEM Design – Fits compatible OMC, Johnson and Evinrude carburetors
- Ideal for Carburetor Rebuilds – Recommended whenever servicing the idle circuit
