Name: Front Engine Sprocket Nut - Hyosung GV125-S EFi [Bobber 125 S]
SKU: 09140-16017JS-GV125S
Availability: InStock

Front Engine Sprocket Nut – Hyosung GV125-S EFi [Bobber 125 S]

Estimated delivery dates: May 16, 2026 - May 18, 2026

£15.99

💎 FRONT SPROCKET NUT | CRITICAL DRIVETRAIN SAFETY

Secure your 125cc power transfer. This essential OEM replacement nut firmly locks your front sprocket in place, preventing movement and ensuring safety. A small, inexpensive part that prevents huge problems.

✅ OEM Quality: Genuine Hyosung-spec part ensures perfect material strength.
🛠️ Visual Look: Supplied in silver or yellow zinc-coated finish (both function identically).
⚙️ Performance Win: Ensures correct torque and safe power delivery to the rear wheel.
📦 What’s Included: 1x Front Engine Sprocket Nut.

💡 CRITICAL WARNING: You MUST use a new locking washer (sprocket retainer) with this nut. Reusing the old washer is a major safety risk as it cannot lock the nut properly!

Description

The front engine sprocket nut is a vital safety component of your GV125-S drivetrain. When you upgrade your chain and sprockets, you need fresh hardware. This is an OEM-grade component designed to handle the torque of your 125cc engine. Don’t risk performance loss or drivetrain failure with a worn or rusted original nut.

💎 Engineered for the GV125-S

Ensuring proper fitment and using quality materials is key to a reliable ride. This part is a small investment that prevents big problems.

High-Grade Steel Built for high torque.	OEM Direct Fit Zero modifications needed.
Safety Critical Locks sprocket in place.	Corrosion Resistant Silver or Yellow Zinc finish.

📜 Confirmed Fitment Guide

✅ FITS: Hyosung GV125-S EFi Models (Aquila / Bobber)
📅 YEARS: 2019+ Onwards (Injected Models Only).
OEM Part Number: 09140-16017JS

💡 [ESSENTIAL PAIRING]:
You *must* replace your front sprocket locking washer at the same time as this nut. It is a one-time use safety component. View GV125-S Locking Washer Here.

🔧 Install Tips

Torque Spec: Check your GV125-S manual for the specific Newton Meters (Nm) (usually 55–65Nm). Use a torque wrench!
Lock it Down: Once tightened, fold the edges of the new locking washer over the flat sides of the nut to prevent it from ever backing out.
Added Security: You can apply a dab of blue (medium strength) threadlocker for extra peace of mind, although the washer does the main locking job.

📧 FITMENT QUESTIONS? Email us for sales support. For community help and installation tutorials, visit the [HyoRiders Forums]