Name: Engine Magneto Flywheel Woodruff Key - Hyosung GT125R GV125 GT125
SKU: 08341-31039
Availability: InStock

Engine Magneto Flywheel Woodruff Key – Hyosung GT125R GV125 GT125

Estimated delivery dates: May 20, 2026 - May 21, 2026

£7.99

💎 ENGINE MAGNETO WOODRUFF KEY | PRECISION FLYWHEEL TIMING

Tiny part, massive responsibility. This precision-machined Woodruff key locks your flywheel to the crankshaft, ensuring your engine timing remains perfect. Essential for any 125cc V-Twin rebuild or stator replacement project.

✅ Timing Security: Keeps the magneto flywheel perfectly aligned with the crankshaft.
🛠️ Rebuild Essential: Replace lost or sheared keys during disassembly to avoid timing slip.
⚙️ 125cc Specific: Precision-fit for legacy carburettor 125cc V-Twin engines.
📦 What’s Included: 1x Hardened Steel Woodruff Key (Order spares if needed!).

⚠️ INSTALLATION WARNING: This part is tiny! Use a magnetic tool or a dab of grease to hold it in place. If it drops into the crankcase, you may have to split the entire engine to get it back.

Description

When you are deep into a 125cc engine rebuild, the smallest hardware often causes the biggest headaches. A worn or slightly deformed Woodruff key can allow the flywheel to “chatter” or shift, leading to ignition timing errors that are a nightmare to diagnose. This hardened steel key is the definitive replacement for your Hyosung, ensuring that your flywheel and crankshaft move in perfect harmony for a long life on the road.

💎 Precision Hardware for Engine Integrity

Don’t reuse a sheared or damaged key; it’s the heart of your engine’s electrical timing.

Hardened Steel Resists shearing under high rotational torque.	Perfect Alignment Ensures the ignition trigger stays at Top Dead Centre.
125cc V-Twin Spec Exactly matches Hyosung OEM Ref: 08341-31039.	Rebuild Ready Small but vital “insurance” for engine projects.

📜 Confirmed Fitment Guide

✅ FITS (125cc Carburettor Models ONLY):
• GT125R / GT125RC (2005–2021)
• GT125 Naked (2003–2021)
• GV125C Aquila Carby (2002–2016)

❌ WILL NOT FIT: Any 250cc models, or GV125S EFI (2019+).

💡 PRO TIP:
If you are pulling the flywheel, you are likely working on the stator or starting system. Check our Stainless Steel Flywheel Plugs to replace those soft, rounded-off factory caps! Browse Engine Plugs here.

🔧 Install Tips

The Grease Trick: Use a tiny amount of thick grease to “stick” the key into the crankshaft slot. This prevents it from falling out while you are sliding the heavy flywheel on.
Don’t Force It: The flywheel should slide over the key smoothly. If you feel resistance, stop—the key might be tilted.

📧 FITMENT QUESTIONS? Email us with your bike details. For technical help with magneto and timing issues, visit the HyoRiders Forums.

OEM Reference Part No: 08341-31039