Stens New Air Filter 100-586 for Lawn-Boy F Series Engines (1978+) | Replaces 107-4621

Premium replacement for Lawn-Boy F Series engines

Keep Lawn-Boy F Series mowers and compact tractors breathing clean air with the Stens 100-586 air filter. Designed for 1978 and newer models, this aftermarket filter mirrors the form and function of the OEM part while offering a practical, cost-conscious alternative. Before you buy, verify the part fits your specific machine to ensure compatibility and a straightforward swap.

What it replaces and compatibility

This filter replaces Lawn-Boy 107-4621, giving you a convenient option when converting or refreshing your air intake. It is compatible with Lawn-Boy F Series engines from 1978 and newer, covering a broad range of equipment that uses this standard filter footprint.

• Brand: Stens
• Qty: 1
• Replaces: Lawn-Boy 107-4621
• Aftermarket replacement

Key specifications

• Width: 2 1/2 inches
• Length: 4 3/8 inches
• Height: 1 1/8 inches

Why choose this replacement

As an aftermarket option, the 100-586 aims to balance affordability with dependable fit. The compact dimensions align with the common footprint of many Lawn-Boy filters, promoting an easy installation and consistent airflow. In real-world use, regular maintenance cycles—especially before peak mowing seasons—often involve swapping in a fresh filter to help the engine breathe more freely and operate with steadier performance.

Real-life use cases

• Spring maintenance on Lawn-Boy machines that rely on the F Series intake system.
• Seasonal tune-ups as part of routine service for improved air quality in the intake path.

Installation tips and notes

• Turn off the engine and remove the air box cover before inspection or replacement.
• Inspect the housing for debris and clean as needed to ensure a good seal.
• Insert the filter with correct orientation and reseal the air box cover securely.
• Run the engine briefly to confirm there are no leaks and the idle remains steady.

Notes: This is an aftermarket part designed as a compatible, cost-conscious alternative to OEM replacements. Always verify fit with your unit’s model and the filter footprint before purchasing to avoid mismatches.