UNI 5579 Air Filter CRF150F/CRF230F NU-4137ST

( Brand: Uni ), ( Manufacturer Part Number: 5579 ), ( Part Type: Filter ), ( Material: Foam ), ( Performance Part: Yes ), ( Item Height: 3.3 ), ( Item Width: 5.95 ), ( Item Length: 6.8 )

Review UNI Honda Crf150f/crf230f Air Filter Model fits CRF150F CRF230F 2003–2015

Introducing the UNI Filter Nu-4137ST air filter, an essential upgrade for the Honda CRF150F and CRF230F models produced between 2003 and 2015. This high-performance air filter is designed to enhance the engine's power output and ensure optimal engine protection.

The Nu-4137ST air filter features a pleated design with a large surface area, allowing it to capture a greater volume of airborne contaminants. Its filter media is made from a specially formulated cotton gauze, ensuring both excellent filtration efficiency and a long service life. The filter's design also incorporates a unique, twin-layer structure, which provides an extra layer of protection against engine damage caused by large particles and water.

This UNI Filter is easy to install, with a shape and size that is directly compatible with the OEM air box on the Honda CRF150F and CRF230F. The filter's design also includes a convenient, tapered shape that facilitates a snug fit within the air box, reducing the risk of engine vacuum leaks.

In addition to its superior filtration capabilities and ease of installation, the Nu-4137ST air filter also offers several other advantages. Its synthetic, oil-lubricated media ensures a consistent flow of clean air to the engine, reducing the risk of engine knocking and pinging. Furthermore, the filter's synthetic media does not require replacement as frequently as traditional paper filters, making it a cost-effective solution for riders who want to save on maintenance costs.

Overall, the UNI Filter Nu-4137ST is an excellent investment for any Honda CRF150F or CRF230F rider who wants to enhance their engine's performance, protect their engine from damage, and save on maintenance costs. Its high-quality construction, advanced filtration capabilities, and easy installation make it a top choice for riders who demand the best from their off-road equipment.

Pros and Cons of Buying Honda CRF150F/CRF230F Air Filter Nu-4137ST

The Honda CRF150F and CRF230F are popular off-road motorcycles known for their durability and performance. Maintaining their air filters regularly is crucial for optimal engine performance and longevity. In this context, we will discuss the pros and cons of purchasing a Nu-4137ST air filter for these models.

1. OEM Quality: The Nu-4137ST is an Original Equipment Manufacturer (OEM) air filter produced by Honda. This means it is designed specifically for the CRF150F and CRF230F, ensuring a perfect fit and optimal engine protection.

2. Enhanced Engine Performance: A clean air filter allows for more air to flow into the engine, resulting in better combustion and increased engine performance. This can lead to improved acceleration and overall riding experience.

3. Longer Engine Life: By using a high-quality, OEM air filter, you can help extend the life of your engine by preventing dirt and debris from entering and causing damage.

4. Reduced Maintenance Costs: While the Nu-4137ST may cost more upfront compared to aftermarket filters, it can save you money in the long run by reducing the need for engine repairs due to dirt-related damages.

1. Higher Upfront Cost: The Nu-4137ST is generally more expensive than aftermarket air filters. This may be a deterrent for some riders, especially those on a tight budget.

2. Limited Availability: Since the Nu-4137ST is an OEM filter, it may not be as widely available as aftermarket filters. This could limit your options for purchasing and may require you to order it online or through a Honda dealership.

3. Frequent Replacements: Depending on riding conditions, the Nu-4137ST may need to be replaced more frequently than aftermarket filters. This is due to its fine filtration capabilities, which can trap smaller particles that may clog the filter faster.

When considering whether to purchase the Nu-4137ST air filter for your Honda CRF150F or CRF230F, it's essential to weigh the pros and cons. While it may be more expensive upfront and require more frequent replacements, the OEM quality, enhanced engine performance, and longer engine life make it a worthwhile investment for those who prioritize the best possible riding experience and engine protection.

If you are an avid off-road rider who values optimal engine performance and long-term engine protection, the Nu-4137ST air filter is an excellent choice for your Honda CRF150F or CRF230F. If budget is a concern, you may want to consider aftermarket air filters as an alternative, but keep in mind that you may sacrifice some engine performance and longevity.

Details:

Item Brand: Uni. Uni Dirt Bike Air Filters are unsurpassed in airflow, dirt stopping and overall performance.Features: designed to fit the factory air box exactly like original filter The best selling replacement filter for competition motorcycles Unique two stage design allows easy complete cleaning Thin Ultra Seal base is virtually impossible tearier-usable, maintenance Used by Factory Yamaha, Kawasaki Suzuki Made USA!Fits: 2003 2015 Honda CRF150F 2003 2015 CRF230F. Item MPN: 5579.

part #: 5579 prices

• $28.30-$47.70

specifications scoofilters:

• for models: Crf150f, Crf230f
• for makes: Honda
• for years: 2003-2015
• brand: Uni
• mpn: 5579
• part type: Filter
• material: Foam
• performance part: Yes
• item height: 3.3
• item width: 5.95
• item length: 6.8

seller scoofilters:

• rating: 99.7%
• # reviews: 321482
• city: Cass City, Michigan

general scoofilters:

• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Air Filters
• condition: New

shipping scoofilters:

• cost: $0.00
• class: Economy, Expedited
• service: FedEx Ground Economy, UPS 2nd Day Air
• type: Fixed
• carrier: FedEx, UPS
• transit: 3-7 Days

payments scoofilters:

• wallet: Apple-pay
• credit card: Diners-club
• other

offer scoofilters:

• options: Ship-to-home
• quantity: 1
• availability: In Stock
• started: February 24, 2026
• sold: 0

returns scoofilters:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

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