VERTEX Titanium Exhaust Valve for KAWASAKI KX 450, KX 450 X, KXF 450 2019-2027

VERTEX offers this exhaust valve for KAWASAKI KX 450, KX 450 X, KXF 450 2019-2027. A four-stroke engine breathes through its valves. The exhaust valves open to let the burnt gases out to the pipe, then close again.

Titanium, steel or stainless valve?

This valve is titanium.

• Titanium: about 40 % lighter than steel, it lets the engine rev high without valve float; standard on most modern 4-stroke motocross bikes. On the downside, it costs more and its coating wears faster if seats and guides are tired.
• Steel or stainless: heavier but very wear-resistant and cheaper; as a titanium replacement it lasts longer, with springs suited to its weight.
• Tip: replace valves as a set, have the seats checked and fit new valve stem seals.

Why choose VERTEX?

Vertex has manufactured in Italy since 1953 and has supplied KTM’s original pistons since 1996 (KTM, Husqvarna, GASGAS), with ISO 9001-certified production.

When should you replace the valves on your KAWASAKI KX 450?

Hard hot starting, valve clearance that keeps closing up or a noisy timing chain: the valve train is wearing.

Specifications and fitting tips

• Material: Titanium
• High thermal resistance
• Benchmark in longevity
• Manufacturer part number: 8400055-1

Cross-Mania tip: Check the guides and seats before reassembly and lap the valves in. Titanium valves must not be fitted on worn seats.

Also needed with this part

• Top-end gasket kit : CENTAURO
• 2-stroke oil : LIQUI MOLY 1 L 3065 · LIQUI MOLY 1 L 3063

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
KAWASAKI KX 450 2026
KAWASAKI KX 450 2025
KAWASAKI KX 450 2024
KAWASAKI KX 450 2023
KAWASAKI KX 450 2022
KAWASAKI KX 450 2021
KAWASAKI KX 450 2020
KAWASAKI KX 450 2019
KAWASAKI KX 450 X 2026
KAWASAKI KX 450 X 2025
KAWASAKI KX 450 X 2024
KAWASAKI KX 450 X 2023
KAWASAKI KXF 450 2027