Name: Cylinder Head Metal Engine Gasket - GT125R GT125 &amp; GV125 Carby
SKU: 11141HG5110
Availability: BackOrder

Cylinder Head Metal Engine Gasket – GT125R GT125 & GV125 Carby

Estimated delivery dates: May 15, 2026 - May 16, 2026

£14.99

💎 CYLINDER HEAD METAL GASKET | RESTORE ENGINE COMPRESSION

Stop Compression Loss: A real seal for high-pressure performance. This solid metal gasket is the only way to properly seal the combustion chamber and oil galleries. Don’t risk a “lazy mechanic” RTV bodge—fix it right the first time to regain lost power.

✅ Construction: Steel for maximum heat durability.
🛠️ Purpose: Stops internal/external oil leaks and fixes misfires.
⚙️ Critical Part: Essential for any top-end rebuild or valve-shim service.
📦 What’s Included: 1x Metal Head Gasket (Single Cylinder).

💡 REBUILD NOTE: This gasket must NOT be re-used once the head is torqued down. If you are doing both cylinders on your 125cc V-Twin, please order two (2x)!

Description

When your 125cc Hyosung starts losing power or “sweating” oil from the head-to-block join, the head gasket is usually the culprit. Unlike cheap paper or liquid alternatives, this metal gasket is designed to withstand the high compression and heat cycles of the air-cooled V-Twin motor. It is the definitive upgrade for anyone decarbonising pistons or performing a full valve-train refresh.

💎 Stop Compression Loss with a Metal Seal

Maintain your engine’s factory performance by ensuring a 100% airtight seal across the cylinder head.

High Pressure Won’t blow out under load.	OEM Reference Matches 11141HG5110.
Thermal Shield Resists high V-Twin heat.	Precision Fit For 125cc Air-Cooled twins.

📜 Confirmed Fitment Guide

✅ FITS: GT125, GT125R, GT125RC, and GT125 Naked (2003-2022).
✅ CRUISERS: GV125C / Aquila 125 (Carburettor Models 1999-2018).
❌ WILL NOT FIT: GV125-S EFI (Liquid Cooled), GV300-S, or any 250cc models.

💡 RECOMMENDED PAIRING:
Replacing the head gasket often means the top-end is apart. Now is the perfect time to replace your [Valve Stem Seals] to stop blue smoke on startup!

🔧 Install Tips

Surface Prep: Use a plastic scraper to remove 100% of old gasket residue and carbon. Surfaces must be “mirror clean” and dry.
No Sealer: Do not use RTV or copper spray. This metal gasket is designed to be installed dry for a factory-standard seal.
Torque Sequence: Always use a torque wrench and follow the cross-pattern tightening sequence to prevent warping the head.

📧 FITMENT QUESTIONS? Email us with your bike details. For technical help or community opinions, visit the HyoRiders Forums.