Name: Engine TDC Inspection Plug (Magnetic Flywheel Viewer Cap) - Hyosung GT125 GT125R GV125
SKU: 448TDCTopPlug
Availability: InStock

Engine TDC Inspection Plug (Magnetic Flywheel Viewer Cap) – Hyosung GT125 GT125R GV125

Estimated delivery dates: Mar 19, 2026 - Mar 21, 2026

£8.00

🧲 MAGNETIC ENGINE PROTECTION | CNC VIEWING PLUG

Style meets function. This isn’t just a “pretty” CNC cap; the integrated magnetic tip acts as a proactive filter, catching microscopic metallic particles as they fly off the flywheel. A must-have for 125cc owners who want to monitor engine health while cleaning up their stator cover’s look.

✅ Magnetic Tip: Actively traps engine wear particles for cleaner oil.
🛠️ CNC Aluminium: Lightweight and finished in tough anodised colours.
⚙️ Anti-Seize: Aluminium construction is much less prone to seizing than the basic factory plug.
📦 Complete Kit: Includes a fresh sealing washer for a leak-free fit.

💡 FITMENT NOTE: This is the Top Viewer Plug used to see the TDC (Top Dead Centre) marks on the flywheel.

This is Specifically for 125cc v-Twin Carb models only.

Description

The stock Hyosung TDC plug is a basic, functional part that often becomes an eyesore or seizes up over time. Our CNC-machined aluminium version is a stylish and functional upgrade designed to protect your engine internals. As your engine wears, small metallic particles are released into the oil—this plug uses a high-strength magnetic tip to catch those particles before they can circulate further, providing an early warning system for proactive riders.

💎 Performance with the Reliability!

Finished in tough anodised colours, this plug adds weather resistance and corrosion protection to the stator cover. Because it’s aluminium, it won’t react with the casing and seize as easily as standard steel hardware, making future valve clearances or timing checks much easier.

Magnetic Protection Traps metallic wear particles.	CNC Machined Lightweight and precision fit.
Anodised Finish Available in various custom colours.	New Washer Included Ready for an immediate swap.

📜 Confirmed Fitment Guide (125cc v-Twin only)

✅ GT125 / GT125R / GT125RC: Carburettor Models (Up to 2018)
✅ GV125 Aquila: Carburettor Models (Up to 2018)

❌ WILL NOT FIT 250cc or 650cc sorry!

Reference OEM Part Number: 09247H12102

💡 ULTIMATE PROTECTION BUNDLE:
If you’re serious about catching metal debris, pair this TDC viewer plug with our [Magnetic Sump Drain Bolt]. Double the magnets means double the protection for your v-twin engine! View the Magnetic Drain Bolt here.

🔧 Expert Installation Tips

Don’t Overtighten: Aluminium threads are strong but don’t need the same “brute force” as steel. Snug is enough to seal the washer.
Check the Magnet: At every oil change, unscrew this plug and wipe any “fuzz” (metal particles) off the tip. It’s a great way to monitor your internal engine health.
Swap & Go: No special tools needed. Simply unscrew the old plastic/steel plug and replace with this CNC beauty.

📧 FITMENT QUESTIONS? Email us with your bike details. For timing tutorials or engine advice, visit the HyoRiders Forums.