The PROX Titanium Exhaust Valve, manufacturer part number 28.4419-1 and vendor part number 28.4419-1, is designed as a direct-fit replacement for select Kawasaki motocross and off-road motorcycles. Manufactured to OEM specifications, this valve supports reliable exhaust-system performance and helps restore proper engine operation during maintenance or top-end service.
Built for durability in demanding riding conditions, the PROX valve is suitable for the Kawasaki KX450F, KX450X and KX450SR models listed below. It is sold individually, making it convenient for replacing a worn or damaged exhaust valve without purchasing unnecessary additional components. Confirm the model year and engine application before installation.
Fitment includes the 2019, 2020, 2021, 2022 and 2023 Kawasaki KX450F; the 2021, 2022 and 2023 Kawasaki KX450X; and the 2022 and 2023 Kawasaki KX450SR. The PROX brand is recognized for replacement engine components engineered to meet demanding performance and service requirements.
Features:
- OEM-specification construction: Manufactured to OEM specifications for dependable fit and function.
- Titanium exhaust valve: Designed for use in the exhaust side of compatible Kawasaki engines.
- Individual replacement: Sold each for targeted valve-service requirements.
- Application-specific fitment: Fits 2019-2023 Kawasaki KX450F, 2021-2023 Kawasaki KX450X and 2022-2023 Kawasaki KX450SR models.
Fitment:
2019 Kawasaki KX450F
2020 Kawasaki KX450F
2021 Kawasaki KX450F
2021 Kawasaki KX450X
2022 Kawasaki KX450F
2022 Kawasaki KX450SR
2022 Kawasaki KX450X
2023 Kawasaki KX450F
2023 Kawasaki KX450SR
2023 Kawasaki KX450X
2024 Kawasaki KX450F
2024 Kawasaki KX450SR
2024 Kawasaki KX450X
2025 Kawasaki KX450F
2025 Kawasaki KX450SR
2025 Kawasaki KX450X
2026 Kawasaki KX450F
2026 Kawasaki KX450SR
2026 Kawasaki KX450X