K&N High Flow Air Filter
1019-0818 (MFG #: DU-9001)
$145.99
Sale price
$145.99
Regular price
$145.99
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K&N High Flow Air Filter for Yamaha YZ400F Dirt Bike
K&N
K&N High Flow Air Filter for Yamaha YZ400F Dirt Bike
K&N
$145.99
Sale price
$145.99
Regular price
$145.99
SKU:1019-0818
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Description
K&N Powersports High-Flow Air Filter
Upgrade your machine’s performance with a K&N High-Flow Powersports Air Filter. Designed to increase airflow while providing superior filtration, these premium reusable filters help your engine breathe better for improved horsepower, throttle response, and overall performance.
Built with oiled cotton gauze media, K&N filters capture dirt and debris while allowing more air to reach the engine compared to traditional paper filters. The result is better performance and long-term reliability for motorcycles, ATVs, UTVs, and other powersports machines.
Unlike disposable filters, K&N air filters are washable and reusable, helping reduce maintenance costs over time. With proper cleaning and oiling, one filter can last for the life of your vehicle.
Key Features
High-flow design improves airflow and engine performance
Superior filtration protects your engine from dirt and debris
Washable and reusable for long-term value
Durable oiled cotton gauze construction
Direct OEM replacement for easy installation
Designed specifically for motorcycles, ATVs, UTVs, and other powersports applications
Why Choose K&N?
K&N is a global leader in high-performance filtration, trusted by riders and racers worldwide. Their powersports air filters are engineered to deliver maximum airflow without sacrificing engine protection, helping you get the most out of your ride.
Technical Specifications
- MFG. Part Number DU-9001
Vehicle Information
Yamaha YZ400F Dirt Bike (1998-1999)
The Yamaha YZ400F, a groundbreaking four-stroke motocross bike, marked a significant turning point in the sport. Offered for the 1998 and 1999 model years, it featured a liquid-cooled, 4-stroke, DOHC 5-valve, single-cylinder 399cc engine. This engine, based on road racing machines, was designed to rev quickly and offer smooth, long-pulling power delivery. The 39mm Keihin FCR carburetor with an accelerator pump was also a key technological advancement for its time, providing excellent throttle response. While the engine and chassis geometry remained largely unchanged, the 1999 model received several refinements compared to the 1998 model. These included a slightly upsized axle, upgraded wheels with improved spokes and Tagasago Excel rims for increased strength, repositioned foot pegs, and a 20 mm larger rear brake rotor for enhanced braking power. No distinct trims were offered during these years, with the focus being on the revolutionary nature of the four-stroke motocrosser itself. FAQ:
Q: Is this product compatible with my Yamaha YZ400F?
A: To ensure exact compatibility with your vehicle, please use our year and model selector located at the top of the page.
Maintenance
| Component | Interval | Details |
| Engine Oil and Oil Filter | Oil: 10 hours (aggressive/race riding) or 15 hours (recreational riding). Filter: with every oil change. | Intervals vary depending on riding conditions (aggressive/race or recreational). |
| Air Filter | 5 hours (aggressive/race riding) or 10 hours (recreational riding). | Cleaning and re-oiling. Inspect after every major ride, especially in dusty or sandy conditions. Replace if damaged or excessively dirty after cleaning. |
| Spark Plug | Annually | Replace every year regardless of use to eliminate malfunction worries. Often checked during valve inspections. |
| Coolant | 10 000 km | Check and fill radiator and sub-tank to appropriate levels. Replace antifreeze with fresh coolant as part of pre-season service. |
| Valve Inspections | 1998 Model: 20 hours (aggressive/race riding) or 30 hours (recreational riding). 1999 Model: 20 hours (all riding styles). | |
| Top-End Inspections | 40 hours (aggressive/race riding) or 60 hours (recreational riding). | Includes cylinder head, piston, and related components. |
| Bottom-End Inspections | 80 hours (aggressive/race riding) or 100 hours (recreational riding). | Includes crankshaft and bearings. |
Maintenance intervals are based on varied sources, including general Yamaha tips. Please consult your vehicle's official owner's manual for precise information.