PROX Titanium Exhaust Valve 28.4355-1 for Kawasaki KX250F and KX250X

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The PROX 28.4355-1 Titanium Exhaust Valve is manufactured to OEM specifications for dependable fitment and performance in select Kawasaki motocross and cross-country applications. This replacement valve is designed for the exhaust side of the cylinder head and is compatible with the 2025 and 2026 Kawasaki KX250F and KX250X.

Built as a direct replacement component, the PROX Titanium Exhaust Valve supports proper engine operation and helps restore reliable valve-train function during an engine rebuild or top-end service. Its OEM-specification manufacturing provides consistent compatibility with the original equipment configuration, making it a practical choice for maintenance and replacement applications.

Fitment: 2025 Kawasaki KX250F, 2025 Kawasaki KX250X, 2026 Kawasaki KX250F, and 2026 Kawasaki KX250X. The PROX manufacturer part number and vendor part number are both 28.4355-1. This valve is sold individually.

Features:

  • Material: Titanium construction for the exhaust valve application
  • Manufacturing Standard: Manufactured to OEM specifications
  • Fitment: Fits 2025 Kawasaki KX250F and KX250X models
  • Fitment: Fits 2026 Kawasaki KX250F and KX250X models
  • Quantity: Sold individually
  • Brand: PROX
  • Manufacturer Part Number: 28.4355-1
  • Vendor Part Number: 28.4355-1

Fitment:
2025 Kawasaki KX250F
2025 Kawasaki KX250X
2026 Kawasaki KX250F
2026 Kawasaki KX250X