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Front Engine Sprocket Nut – Hyosung GV125 GT250 GT125R GV250 RT125D

Estimated delivery dates: Sep 3, 2026 - Sep 5, 2026

£12.99

🔩 CRITICAL DRIVETRAIN SAFETY // OEM SPEC FRONT SPROCKET NUT

Don’t risk a costly breakdown or severe transmission case wreckage on the road. This small but vital component keeps your front engine gear securely locked onto the spinning shaft, making a fresh Hyosung front sprocket nut swap at every chain service the absolute safest way to prevent accidental loosening during your next maintenance project.

  • OEM Fit // Engineered precisely to match original factory dimensions, ensuring perfect biting engagement across the shaft.
  • Strong Steel // Heavy-duty metal construction built to handle extreme engine vibration and high-speed torque loads without backing off.
  • Safety Essential // A mandatory replacement item every single time you change the front sprocket. 
  • In Stock // Ready for your final drive system maintenance work. Supplied as 1x nut.
⚠️ CRITICAL SECURITY WARNING: You MUST use a new front sprocket lock washer with this new nut. Reusing a fatigued, bent safety lock tab risks the nut spinning off entirely under load, causing massive engine damage!
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Description

Your front sprocket nut might be a small component hidden underneath the engine casing panel, but it plays an incredibly critical role in keeping your entire drivetrain secure. Whether you are executing a full chain and gear replacement on the workbench or just want complete peace of mind before a long road trip, this high-tensile replacement nut is an essential, cost-effective safety update. As your bike handles daily riding and touring, a fatigued or stretched original fastener can gradually work itself loose. Sourcing this fresh Hyosung front sprocket nut prevents catastrophic shaft slippage and dangerous ride failures, keeping your machine fully secure across your latest restoration project.

This aftermarket replacement part is manufactured precisely to original factory specifications to ensure absolute torque retention and perfect thread engagement. The heavy-duty steel body absorbs intense single-cylinder or V-twin firing pulses cleanly without backing away under regular riding conditions. Sent from our UK inventory in a durable protective finish, this part replaces your rounded or weathered original nuts cleanly, making future sprocket swaps completely hassle-free on everyday journeys.

💎 TRANSMISSION SECURITY HYOSUNG FRONT SPROCKET NUT OVERVIEW

Original SpecificationTurned accurately to mirror factory thread pitch and width for zero binding on the shaft. High-Tensile Structural SteelTough material build that resists stripping out when tightened down hard with manual tools.
Mandatory Maintenance SafetyProvides much better clamping pressure than an old, stretched nut that has been unbolted multiple times. Direct Workbench MatchConfigured to drop straight into the original engine output shaft to replace reference part number: 09140-16017.

📜 Confirmed Model Fitment

Hyosung Models: Output shaft diameters are verified strictly for the standard V-twin and single-cylinder bikes listed below within their specific model year ranges. 

GV Aquila 125
Up to 2017 models
GT125R / GT125RC
Up to 2021 models
GT125 Naked Comet
Up to 2021 models
GV250 Aquila
2003 to 2018 models
GT250R / GT250RC
Up to 2022 models
RX125 / RT125D Karion
All production years

🔧 Installation Tips & Help

It is completely critical that you follow these workbench tips to secure a completely safe installation:

  • The Lock Washer Replacement is Mandatory: You must swap out your original front sprocket washer/safety lock tab at the exact same moment on the bench. Neglecting this simple step can allow the bolt to slide off under load, leading to immediate engine casing cracks.
  • Lock the Rear Wheel Securely: Put the transmission gearbox firmly into first gear and have a helper step hard down on the rear brake pedal. This stops the output spindle from rotating out of control while you apply force with your hand wrench.
  • Torque to Spec and Fold the Tab: Tighten the new part down cleanly to full factory specification metrics using a manual hand tool. Once torqued down, use a chisel tool to bend the side flat tab of your lock washer flush against the hex nut edge to lock it physically.
📧 NOT SURE HOW TO CALCULATE THE EXACT FINAL DRIVE SPECIFICATION COMFORTABLY? If your drive chain is slack or you want to verify your output shaft dimensions before unboxing your order, you can upload a crisp photo of your setup on our boards to get quick help. For fast sales support, email us your question or if you want to locate fast sprocket tutorials, head straight over to our community forum boards.

Additional information

Weight 0.6 kg
Dimensions 4 × 4 × 3 cm

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