Prox Valve stem seals Valve stem sealRef : PRO00047A / 1117580

PROX Valve Stem Seals by PROX — essential wear parts for maintaining the cylinder head of your motocross machine. These valve stem seals are designed to ensure a tight seal around the guides and limit oil leaks into the combustion chamber, which is crucial for keeping an engine clean and meeting the demands of off-road riding.

• Manufactured by renowned OEM factories in Japan (NOK, ARS).
• Made from premium quality materials, to OEM specifications and tolerances.
• Low friction design and enhanced sealing for optimised longevity.
• Suitable for MX, Dirtbike, Roadbike, and ATV applications — particularly recommended for motocross use.

Whether you are doing enduro sessions, track runs, or workshop maintenance, these seals protect the valve guides from premature wear and limit oil consumption due to leaks. Replace them during a cylinder head overhaul or as soon as you notice signs of seepage or smoke from the exhaust.

Manufacturer reference: 35.VS027

Frequently compatible motorcycles:

• YAMAHA YZ 250 F (2026 - 250 cc)
• FANTIC XXF 250 (2024 - 250 cc)
• YAMAHA YZ 250 FX (2024 - 250 cc)