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K&N KA-4018 Engine Air Filter
| Brand | K&N KA-4018 |
|---|---|
| Air Filter Material | Cotton gauze |
| Air Filter Shape | Trapezoidal |
| Filter Re-Oiling Amount | 0.69 oz (20 ml) |
| Frame Design | Rigid |
| Height | 1.813 in (46 mm) |
| Item Type | High performance |
| Oil Included | Filter is pre-oiled |
| Outside Length | 9.563 in (243 mm) |
| Outside Width | 5.938 in (151 mm) |
| Package Contents | 1 air filter |
| Package Material | Paperboard |
| Package Quantity | 1 |
| Package Type | Box |
| Pre-Screened | No |
| Product Style | Unique air filters |
| Title | K&n ka-4018 replacement air filter |
| Warranty | 1,000,000 miles/10 year |
| Washable | Yes |
| Weight | 0.9 lb (0.4 kg) |
| Fits | Kawasaki · 23 vehicles |
Reusable design. Washable cotton gauze media supports service-based maintenance.
Pre-oiled filter. Ready for installation with a rigid frame for consistent support.
Application-specific fit. Engineered for select Kawasaki motorcycle airbox dimensions.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Replacement Air Filter for Kawasaki
K&N KA-4018 is a high-performance replacement engine air filter built for specific Kawasaki motorcycle applications. It uses cotton gauze media, a rigid frame, and a pre-oiled design to deliver low restriction while maintaining engine protection.
Key Features
- Cotton gauze filter media for reusable filtration performance
- Rigid frame design for consistent fit and support
- Pre-oiled filter supplied ready for service
- Washable construction for maintenance-based reuse
- Trapezoidal filter shape matched to the application
Detailed Description
The K&N KA-4018 is a replacement air filter engineered for select Kawasaki models, including Ninja 400, Z400, and KLE500 applications. It is built as a direct replacement for the stock motorcycle air filter element and is shaped to match the specific airbox design used in those applications. The cotton gauze media and rigid frame are intended to balance airflow and engine protection, while the pre-oiled construction simplifies initial installation and service preparation. This part number, KA-4018, is also identified as a K&N replacement air filter for the same application.
K&N’s high-flow filter design focuses on reduced intake restriction without sacrificing filtration performance. For riders maintaining a Kawasaki Ninja 400, Kawasaki Z400, or Kawasaki KLE500, this filter provides a serviceable alternative to disposable paper elements and supports routine maintenance with a washable format.
What It Is Used For
- Replacing a clogged or restricted stock air filter
- Restoring intake airflow on a service interval
- Addressing reduced throttle response caused by a dirty filter
- Maintaining filtration performance in a reusable format
- Supporting routine airbox service on Kawasaki motorcycle applications
Installation Notes and Tips
Verify the airbox shape and application match before installation. The filter is pre-oiled, so handle it carefully to avoid contaminating surrounding intake components. Follow the manufacturer’s cleaning and re-oiling instructions during future service intervals. Confirm fitment for your exact Kawasaki model and trim before ordering.
Quality Assurance
K&N backs this filter with a 1,000,000-mile/10-year warranty. The KA-4018 is engineered for application-specific fitment and built to provide dependable engine protection in service.
| Year | Make | Model | Liters | Cylinders | Notes |
|---|---|---|---|---|---|
| 2026 | Kawasaki | KLE500 | -L | -- | — |
| 2026 | Kawasaki | KLE500 SE | -L | -- | — |
| 2023 | Kawasaki | EX400 Ninja 400 | -L | -- | — |
| 2023 | Kawasaki | EX400 Ninja 400 ABS | -L | -- | — |
| 2023 | Kawasaki | EX400 Ninja 400 ABS KRT Edition | -L | -- | — |
| 2023 | Kawasaki | EX400 Ninja 400 KRT Edition | -L | -- | — |
| 2023 | Kawasaki | Z400 ABS | -L | -- | — |
| 2022 | Kawasaki | ER400 Z400 ABS | -L | -- | — |
| 2022 | Kawasaki | EX400 Ninja 400 | -L | -- | — |
| 2022 | Kawasaki | EX400 Ninja 400 ABS | -L | -- | — |
| 2022 | Kawasaki | EX400 Ninja 400 ABS KRT Edition | -L | -- | — |
| 2021 | Kawasaki | ER400 Z400 ABS | -L | -- | — |
| 2021 | Kawasaki | EX400 Ninja 400 | -L | -- | — |
| 2021 | Kawasaki | EX400 Ninja 400 ABS | -L | -- | — |
| 2020 | Kawasaki | ER400 Z400 ABS | -L | -- | — |
| 2020 | Kawasaki | EX400 Ninja 400 | -L | -- | — |
| 2020 | Kawasaki | EX400 Ninja 400 ABS | -L | -- | — |
| 2020 | Kawasaki | EX400 Ninja 400 ABS KRT Edition | -L | -- | — |
| 2020 | Kawasaki | EX400 Ninja 400 KRT Edition | -L | -- | — |
| 2019 | Kawasaki | EX400 Ninja 400 | -L | -- | — |
| 2019 | Kawasaki | EX400 Ninja 400 ABS | -L | -- | — |
| 2019 | Kawasaki | EX400 Ninja 400 ABS SE | -L | -- | — |
| 2019 | Kawasaki | Z400 ABS | -L | -- | — |
| No rows match your filter. | |||||