| Attribute | Specification |
|---|---|
| Production Years | 1987-2004 |
| Engine Oil | SAE 10W-40 API SE, SF, SG (1.5 L) |
| Front Tires | AT 21 x 7-10 |
| Rear Tires | AT 22 x 10-10 |
| Tire Pressure | 0.2 bar (2.8 psi) |
| Spark Plug | NGK DP8EA-9 |
Engineering Highlight: The DOHC Pioneer
The Kawasaki KFX 250 Mojave, designated internally as the KSF250, holds a unique place in ATV history as one of the first sport quads to utilize a liquid-cooled, Dual Overhead Cam (DOHC) 4-valve engine. While its competitors were often relying on simpler SOHC or air-cooled designs, Kawasaki adapted technology from its high-performance Ninja street bike series. This high-revving architecture allowed the 249cc powerplant to deliver a remarkably flat torque curve and superior top-end power, making it a favorite for technical trails and amateur racing for nearly two decades.
Technical Overview: A1-A16 Evolution
Spanning from 1987 (A1) to 2004 (A16), the Mojave remained largely unchanged, a testament to its robust initial design. The heart of the machine is a 249cc four-stroke engine paired with a 5-speed manual transmission and a dedicated reverse gear. This combination offered versatility that few other machines in the 250cc class could match at the time.
The chassis features a double-wishbone front suspension and a Uni-Trak swingarm at the rear, providing a balanced ride quality. Its kick-start mechanism, while requiring a specific technique due to the high-compression DOHC head, remains a hallmark of its weight-saving, performance-oriented philosophy.
Maintenance Guide & Essentials
Engine Lubrication
To maintain the high-revving DOHC valvetrain, regular oil changes are critical. The KSF250 requires 1.5 Liters of SAE 10W-40 oil. Ensure the oil meets API SE, SF, or SG specifications to protect the wet clutch system. Given the age of these units, we recommend shorter change intervals if used in dusty or high-load environments.
Ignition & Spark
The engine utilizes an NGK DP8EA-9 spark plug. Proper gapping and heat range are essential to prevent carbon fouling or pre-ignition in the high-compression combustion chamber. Always inspect the plug boot for cracks, as moisture ingress can cause intermittent misfires.
Tires and Traction
The Mojave runs a staggered setup: AT 21 x 7-10 in the front and AT 22 x 10-10 in the rear. To achieve the intended footprint and shock absorption, maintain a low pressure of 0.2 bar (2.8 psi). Over-inflating these tires significantly degrades the machine’s ability to track straight in rough terrain.
Editor’s Verdict
The Kawasaki KFX 250 Mojave is a masterclass in longevity. For the enthusiast, it offers a mechanical purity that modern EFI machines lack. Provided the cooling system is maintained and the valves are adjusted according to the A1-A16 service intervals, the KSF250 remains one of the most reliable and engaging mid-bore sport ATVs ever produced.