Walbro 98-345-7 Needle Adjust Spring Carburetor OEM Part

The Walbro 98-345-7 is a genuine OEM needle adjust spring designed for use in Walbro diaphragm carburetors found on a wide range of small engines. This small but critical component provides the precise tension needed to control the needle valve's seating pressure, directly affecting fuel metering and engine performance.

The needle adjust spring works in conjunction with the carburetor's metering lever and inlet needle valve to regulate fuel flow into the metering chamber. Proper spring tension ensures the inlet needle seats and unseats at the correct pop-off pressure, typically around 10–12 PSI on most Walbro carburetors. A worn, stretched, or deformed spring can lead to flooding, lean conditions, erratic idling, or poor throttle response.

Key Features:

• Genuine OEM Walbro replacement part — ensures correct tension and fit
• Controls inlet needle valve seating pressure for proper fuel metering
• Compatible with a wide range of Walbro diaphragm carburetors used in chainsaws, trimmers, blowers, and other small engine equipment
• Direct OEM replacement for worn, stretched, or damaged needle adjust springs
• Essential component during carburetor rebuild or overhaul

Replace this spring whenever performing a carburetor rebuild or when pop-off pressure testing reveals out-of-spec reseat pressure. Using the correct OEM spring is critical — substituting an incorrect spring will result in improper fuel delivery and poor engine performance.