1989-2004 Kawasaki KX500 Billet Cylinder Head Kit

Introducing the ultimate precision-machined KX500 cylinder head from Two-Strokes Only, featuring an interchangeable combustion chamber specifically engineered for optimal power for your riding conditions. This head boasts a raw, exposed finish that highlights the precision of its machining, coupled with significantly improved water ducting to keep your engine running cooler and harder, from the gate drop to the checkered flag.

Precision Engineering & Contents

• Manufactured from a high-quality alloy for maximum durability and heat transfer.

• Secure Sealing: Utilizes O-rings for a perfect seal (O-rings included).

• Easy Starts: A KPMI decompression valve is included, making starting challenging engines like the KX500 exceptionally easy. Simply push the button and fire it up—the valve closes automatically once the engine is running.

• In the Box: Decompression valve, 7 copper washers, and 7 nutcaps are all included, O-rings.

The Enemy of Power: Heat

Heat is the ultimate enemy of any engine, especially high-performance two-strokes. As the race progresses and engine temperatures climb, power naturally drops off. If you’ve noticed your engine losing its edge late in a moto, or you struggle to clear the same jumps you made early on, you’re experiencing heat soak.

Our Solution: Superior Cooling

For years, Two-Strokes Only has been at the forefront of two-stroke performance. Our engineers recognized that traditional stock heads, made via casting, resulted in small, rough, and inefficient water jackets that severely restrict optimal coolant flow.

Our innovation was to precision-machine the cylinder head in two separate pieces and optimize the flow of all of our heads using modern design and simulation tools such as CFD. This design achieves vastly superior flow dynamics and cooling efficiency, ensuring that the power you start with is the power you finish with. Experience consistent, race-winning performance.