Aftermarket Air Filter Instruction Manual

1. Product Overview

This document provides instructions for the installation and maintenance of an aftermarket air filter designed for various STIHL outdoor power equipment models. The air filter is a crucial component that protects the engine from dust, debris, and other contaminants, ensuring optimal performance and longevity.

This replacement air filter is constructed from woven fabric and foam, engineered to meet or exceed the performance of the original equipment manufacturer (OEM) part.

2. Compatibility

This aftermarket air filter is compatible with STIHL part number 4180-120-1800 and is designed for use with the following STIHL models:

• FC100, FC110, FC90, FC95
• FR130
• FS90R, FS100, FS100ARX, FS110, FS130, FS310, FS87, FS90
• FT100, FX130
• HL100, HL90, HL95
• HT100, HT101, HT130, HT131
• KM100, KM110, KM130, KM90
• SP90

Important: Always verify compatibility by checking the OEM part number on your existing air filter or in your equipment's manual. Model numbers alone may not guarantee a perfect fit due to variations in manufacturing or regional versions.

3. Installation Instructions

Before beginning any maintenance, ensure the equipment is turned off, cooled down, and any spark plug wires are disconnected to prevent accidental starting.

1. Locate the Air Filter Cover: The air filter is typically housed under a cover on the engine, often secured by clips or screws.
2. Remove the Cover: Carefully unclip or unscrew the air filter cover and set it aside.
3. Remove the Old Air Filter: Take out the old, dirty air filter. Note its orientation for correct installation of the new filter.
4. Clean the Air Filter Housing: Use a clean cloth or compressed air to remove any dust, dirt, or debris from the air filter housing. Ensure no debris falls into the carburetor or engine intake.
5. Install the New Air Filter: Place the new aftermarket air filter (part number 4180-120-1800) into the housing, ensuring it fits snugly and is oriented correctly.
6. Replace the Cover: Reattach the air filter cover, securing it with the clips or screws. Ensure it is properly sealed to prevent unfiltered air from entering the engine.

Image: Aftermarket Air Filter, compatible with STIHL models. This image shows the trapezoidal shape and woven fabric/foam construction of the air filter.

4. Maintenance

Regular inspection and maintenance of your air filter are essential for the efficient operation of your STIHL equipment.

• Inspection: Check the air filter frequently, especially when operating in dusty conditions. A dirty filter can restrict airflow, leading to reduced engine power and increased fuel consumption.
• Cleaning: For light dust, the filter may be gently tapped to dislodge debris or cleaned with compressed air (blowing from the inside out). Do not wash the filter with water or cleaning solutions unless specifically designed for that purpose, as this can damage the filter material.
• Replacement: Replace the air filter if it is heavily soiled, damaged, or cannot be effectively cleaned. The frequency of replacement depends on usage and operating conditions, but generally, it should be replaced at least once per season or every 25-50 operating hours.

5. Troubleshooting

If your equipment experiences performance issues, a clogged or dirty air filter could be a contributing factor.

• Engine Not Starting: A severely clogged air filter can prevent the engine from getting enough air, making it difficult to start.
• Loss of Power: Reduced engine power or sputtering during operation can indicate a restricted air filter.
• Increased Fuel Consumption: An engine struggling due to a dirty air filter may consume more fuel than usual.
• Excessive Smoke: While less common, a very rich fuel mixture caused by insufficient air can lead to black smoke from the exhaust.

If you encounter these issues, inspect and clean or replace the air filter as the first troubleshooting step.

6. Specifications

7. Warranty and Support

As an aftermarket product, warranty coverage is typically provided by the specific seller or manufacturer from whom the product was purchased. Please refer to your purchase documentation or contact your retailer directly for details regarding warranty terms and support.

For technical assistance or further inquiries, please reach out to the customer support of the vendor where you acquired this air filter.