Cylinder Head Valve Cover Rubber Gasket – GT125 GV250 GT250 GV125C

Description

A valve cover gasket is a critical engine seal that prevents oil leaks around the top end of your Hyosung motor. If your rocker cover is sweating oil, especially near the rear cylinder on 125cc engines — this is likely the culprit!

This replacement rubber gasket is ideal if:

🔧 You’re seeing oil leaks around the valve covers
🔧 The old gasket has hardened or shrunk from heat cycles
🔧 A previous owner used messy RTV instead of a proper seal
🔧 You’re rebuilding or refreshing the top end of your engine

✅ No need to mess around with glue or silicone — this factory-style gasket seats neatly in the valve cover channel and compresses cleanly when torqued to spec.

✅ Confirmed Fitment:

📍 GT125 / GT125R – 2003 to 2022
📍 GT250 / GT250R – 2003 to 2022
📍 GV125C / GV250 – 1999 to 2018

❌ Does NOT fit GV125S EFI (2018–2025+)
❌ Does NOT fit GV300S / GV300SS

📎 OEM Ref: 11173HG5100

🛠 Installation Tips:

• Remove your old valve cover carefully and clean both sealing surfaces thoroughly — no oil, old gasket, or debris should remain

• Seat the new rubber gasket into the channel of the cover and press it evenly into place

• Avoid using RTV or silicone — this is a rubber gasket, not a paper one

• Tighten bolts evenly and to correct torque (do not overtighten, as it may squash the gasket unevenly or cause leaks)

⚠️ We recommend checking your valve clearance at the same time if you haven’t done it in a while — ideal time to combine both jobs.