[Lifetime Warranty] MS250 Air Filter Tune-Up Kit - Compatible with Stihl 021 023 025 MS210 MS230 MS250C MS210C MS230C MS250 230 210 Chainsaw - Replaces 1123 120 1613, 1123 120 1612 with Fuel Filter Spark Plug

MS250 / MS230 / MS210 Air Filter & Tune-Up Kit

Key Features

• High-Efficiency Pleated Media: The air filter features premium pleated paper designed to maximize surface area, providing superior dust-holding capacity compared to standard foam filters.
• Precision-Molded Seal: Engineered with a high-grade rubberized gasket to ensure a 100% vacuum seal against the carburetor intake, preventing fine sawdust from entering the engine.
• Weighted Fuel Filtration: Includes a heavy-duty fuel filter with a metal weight, ensuring the pickup remains submerged in fuel regardless of the chainsaw's orientation during steep cuts.
• Optimized Ignition: Comes with a factory-gapped spark plug designed to handle the high-heat cycles of 40cc-45cc 2-stroke engines.
• All-In-One Maintenance: A comprehensive kit that addresses the three most critical wear items for maintaining engine compression, fuel delivery, and airflow.

Replaces / Cross-Reference Part Numbers

• Stihl Air Filter: 1123 120 1613, 1123 120 1612, 1123 160 1650
• Stihl Fuel Filter: 0000 350 3500
• Stihl Spark Plug: 0000 400 7000 (NGK BPMR7A equivalent)

Compatibility & Fitment

This kit is designed specifically for the Stihl 1123 engine platform. Key compatible models include:

• Stihl MS Series: MS210, MS210C, MS230, MS230C, MS250, MS250C.
• Stihl 0-Series: 021, 023, 025.
• Note: This is the curved-top pleated filter style. Please verify your air filter cover shape, as some early models may use a flat foam pad.

When to Replace

• Loss of Power: The saw feels "lazy" or won't reach full RPM under load, often caused by a restricted air filter.
• Bogging in Vertical Cuts: The saw dies or sputters when turned on its side, indicating the fuel filter is clogged or the fuel line is collapsing.
• Increased Fuel Consumption: A dirty air filter creates a "rich" condition, sucking in too much fuel and not enough air.
• Engine Misfires: Rhythmic stuttering or difficulty starting, typically solved by the included spark plug replacement.
• Visible Debris: If the pleated filter looks dark or "fuzzy" with oil and sawdust, it cannot be effectively cleaned and must be replaced.

Installation Tips

• The Bellows Test: When installing the air filter, ensure the "tabs" on the base of the filter snap firmly into the air box. A loose filter will allow sawdust to bypass the media and score your cylinder walls.
• Fuel Line Hook: Use a piece of bent wire or a specialized fuel line tool to fish the fuel filter out of the tank. Be careful not to nick or cut the rubber fuel line during this process.
• Don't Blow Inward: Never use compressed air to clean a paper filter while it is attached to the saw, as this can force dirt directly into the carburetor throat.
• Check the Case: While the air filter is off, use a damp rag to clean the surrounding plastic housing to prevent debris from falling into the intake when you seat the new filter.
• Spark Plug Gap: Double-check the spark plug gap (0.5 mm / 0.020") before installation to ensure the strongest possible spark.