BS4281
Blue Sky Filter
8421230000
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| Part Name | Motorcycle Air Filter Replacement Fit for Kawasakis Ninja 400 / Z400 / EX400 |
| BS Number | BS4281 |
| Size | 235*96mm/9.25*3.78inch (Customized) |
| Color | Black and Red (Can Be Customized) |
| Structure | Filter and Rubber |
| Fits Model | for Kawasakis Ninja 400, Z400, Ex400 |
| Special Properties | Long service life with strong contaminant resistance Available for wholesale, brand customization, and OEM/ODM cooperation Factory supply with competitive lead times |
| Supplier | Nanjing Blue Sky Filter |
| Packaging | Can be Customized |
*This is not a OEM product. The brand names and logos are the registered trademarks of their respective owners. Any use of the brand names or model designations for this product are made solely for purposes of demonstrating compatibility.All brand names and model numbers mentioned are for compatibility purposes only. We do not claim affiliation with or endorsement by the original brand owners. Products are manufactured by us and can be customized with your brand.
*Detailed Photos





Fit for Ninja 400 Z400 EX400: Designed for compatible Kawasakis Ninja 400, Z400 and EX400 motorcycle intake systems.
Engine Intake Protection: Helps reduce dust, road dirt and airborne particles entering the motorcycle engine.
Stable Airflow Support: Clean filter media supports smoother intake airflow and stable riding performance.
Reliable Filter Media: Filter structure helps capture particles while maintaining suitable airflow for daily motorcycle use.
Direct Replacement Design: Suitable for routine motorcycle maintenance and replacement of old or clogged air filters.
Durable Frame Structure: Stable frame and sealing edge help support secure installation and reduce air bypass.
Suitable for Parts Supply: Ideal for motorcycle parts distributors, repair shops, e-commerce sellers and aftermarket replacement programs.
OEM & ODM Customization: Filter media, frame color, size, logo, label, retail box and bulk packaging can be customized.
FAQ
Q1: What is this motorcycle air filter used for?
A1: This motorcycle air filter is used to filter intake air before it enters the engine, helping reduce dust, road dirt and small particles.
Q2: Which motorcycle models does this air filter fit?
A2: It is designed to fit compatible Kawasakis Ninja 400, Z400 and EX400 motorcycle models. Buyers should confirm the original filter shape and size before ordering.
Q3: What does this air filter help protect?
A3: It helps protect the motorcycle engine intake system by reducing dust, sand, debris and airborne particles from entering the engine.
Q4: Can this filter support stable airflow?
A4: Yes. Clean filter media helps maintain smoother intake airflow and supports stable engine operation during riding.
Q5: Is this air filter suitable for daily motorcycle maintenance?
A5: Yes. It is suitable for routine replacement during motorcycle maintenance, repair and aftermarket parts supply.
Q6: Is this a washable motorcycle air filter?
A6: Washable performance depends on the selected filter media. Paper, cotton, foam and other media options can be customized according to buyer requirements.
Q7: When should a motorcycle air filter be replaced?
A7: It should be replaced when the filter becomes dirty, clogged, damaged or when airflow performance drops during routine maintenance.
Q8: What should buyers confirm before ordering?
A8: Buyers should confirm motorcycle model, year, original filter dimensions, filter shape and intake box structure before purchasing.
Q9: Can this motorcycle air filter be customized?
A9: Yes. Filter media, size, frame color, logo, label, color box, carton and pack quantity can be customized for OEM / ODM orders.
Q10: Is this an original Kawasaki air filter?
A10: No. This is a replacement air filter made for compatible motorcycle models. Brand names and model numbers are used only for compatibility reference.





Nanjing Blue Sky Filter Co., Ltd. was founded in 2009. Blue Sky manufactures and sells various types of air filters and has expanded the product range to water filtration products, kitchen filtration products, and automotive filtration products etc. The company's products are exported to international markets of 48 countries.
Since its establishment, Nanjing Blue Sky Filter Co., Ltd. has steadily grown and has obtained ISO9001 and ISO14001 certifications. Blue Sky has been recognized as a National High-Tech Enterprise and hold multiple 8patents and quality inspection reports. Blue Sky boasts a modern standardized workshop, advanced production equipment, well-designed production lines, strict quality control, and a management system to ensure that customers receive the best cooperation and service. All true high-efficiency filters are produced in a standardized dust-free workshop. We also have a comprehensive and advanced testing laboratory to ensure the high-quality performance of HEPA filters.
Blue Sky’s filtration products are produced with various environmentally friendly materials and advanced production facilities to meet customized specifications and some special requirements. Blue Sky’s filtration products strictly adhere to domestic and international standards, such as EN779 and EN1822 etc.
Blue Sky’s technical team excels in developing various new filtration products for many appliances and machines, residential, commercial, and industrial applications.
Blue Sky has a well-trained, highly qualified team of engineers and a sales team dedicated to market and customer service. We provide integrated services to customers worldwide, not only offering mature filtration products but also designing and developing new filtration products for our customers. We are confident that with our production capabilities and experience, we can help customers gain a competitive advantage.
Blue Sky‘s motto is to be a eco-friendly and sustainable company, providing customers with competitive high-quality filter products, and growing together!
1、Integrated Manufacturing and Logistics: Offers comprehensive services from production to shipment.
2、Extensive Product Line: Covers air, water, kitchen, and automotive filtration products.
3、International Quality Certifications: Holds ISO9001, ISO14001 certifications, and multiple patents.
4、Customized Services: Provides customized solutions for special specifications and requirements.
5、Global Service: Products are exported to more than 45 countries and areas, with rich international service experience.
6、Advanced Production Facilities: Standardized dust-free workshops and strict quality control.
7、Continuous Innovation: Constantly developing new products to maintain technological leadership.
8、Professional Team: Well-trained engineers and sales team offering support.
9、Eco-friendly and Sustainable: Committed to using environmentally friendly materials and sustainable development.
10、High Customer Loyalty: Quality products and services earn customer trust.



Yes, We are a professional manufacturer that welcomes customization, including raw material selection, specific logo printing, and packaging. Additionally, we can produce items according to your samples or drawings.
Vacuum Cleaner Filters, Air Purifier Filters, HVAC Filters, Automobile Filters, Industrial Filters, Humidifier Filters, Cooker Hood Filters, Medical Filters and other filters etc.
You can have the following services from our team: Customized Product Solutions (Including the certain designs), Quality Assurance, New product's R&D, Global Logistics per request, After-Sales Support etc.
You can pay in various ways, such as T/T , L/C, D/P, Credit Card, Paypal, Payoneer and etc.
The production time depends on the order quantity and product type . Usually, it takes about 30 days to fulfill a 20' container order.
The shipment to deliver the goods can be arranged by our team according to the customer's request, and the customer can also let his own logisitics agency to do the work.
Our company is truly responsible for the supplied products throughout its warranty period.
Our team of skilled engineers and technical experts is available around the clock to assist you with any questions or issues that may arise, ensuring your complete satisfaction with our products and services.
Our team has been working in the filtering industry for 16 years, and focuses on the following principles to keep the long-term and good relation with the customers:
Mutual Respect and Trust, Consistent Quality and Reliability, Open and Transparent Communication,
Adaptability and Flexibility, Continuous Improvement, Attentive After-Sales Support and Service.
