Engine Magneto Flywheel Woodruff Key – Hyosung GT125R GV125 GT125
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!).
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
• GT125R / GT125RC (2005–2021)
• GT125 Naked (2003–2021)
• GV125C Aquila Carby (2002–2016)
❌ WILL NOT FIT: Any 250cc models, or GV125S EFI (2019+).
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
Additional information
| Weight | 0.2 kg |
|---|---|
| Dimensions | 5 × 5 × 1 cm |
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GARAGE PICKS // ADD TO BUILD
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Japan D.I.D Cam Shaft Chain – Hyosung GT250 GV250 RX125 RT125
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Engine CamShaft Timing Cam Chain – Hyosung GT125 GT125R GV125
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Independent Shop supplying ride enhancements and quality spares with fast dispatch. Need assistance? Access our workshop guides, manuals, tutorials or drop by the forums for troubleshooting help.
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