Name: Carburettor Needle Acorn Nut [Carb Hollow Brass Screw] - Hyosung GT125R GV250 GT250R GV125
SKU: 13329HG5100
Availability: InStock

Carburettor Needle Acorn Nut [Carb Hollow Brass Screw] – Hyosung GT125R GV250 GT250R GV125

Estimated delivery dates: May 2, 2026 - May 4, 2026

£13.99

🇯🇵 JAPANESE SPEC | PRECISION FUEL HARDWARE

Inexpensive insurance for your fuel system. Crafted to Mikuni standards, this hollow brass acorn nut ensures your needle is seated perfectly for smooth throttle response. Don’t risk your carb build with cheap fakes that lead to leaks or stripped threads.

✅ Japanese Made: Built to the exact tolerances of your original Hyosung carbs.
🛠️ Maintenance Essential: A vital backup part for any carb rebuild or cleaning.
⚙️ Smooth Response: Ensures perfect needle alignment for consistent idling.
📦 Note: Sold as 1x piece.
Select “2” at checkout for a full vTwin service.

💡 BRASS ALERT: These are delicate hollow screws. Replace them if the head shows signs of rounding to avoid getting stuck during future jetting.

Description

When maintaining or rebuilding the carburettors on your Hyosung vTwin, the small details matter most. This genuine Japanese-made needle acorn nut is a precision-engineered hollow brass screw designed to keep your fuel needle secure and aligned. As your bike lives its life on the road, these soft brass components can corrode or strip—having a fresh, genuine replacement on hand is the best way to ensure a hassle-free service.

💎 Performance with the Reliability!

Sourced to match the original Mikuni specifications, this nut provides a 100% airtight seal within the carb body, preventing the erratic idling and rich-running issues caused by “near-fit” aftermarket copies.

Mikuni Standard Genuine Japanese precision.	Hollow Flow Design Ensures correct fuel pressure.
Direct Swap Exact fit for 125/250 carbs.	In Stock UK Fast shipping for your rebuild.

📜 Confirmed Fitment Guide (Carburettor Models)

✅ FITS: Hyosung GT125, GT125R, GT125RC (All Carb Years)
✅ FITS: Hyosung GV125 Aquila (Up to 2017)
✅ FITS: Hyosung GT250, GT250R, GV250 (All Carburettor Models)

OEM Part Number: 13329HG5100

💡 SERVICING YOUR CARBS?
Don’t stop at the needle. While the bowls are off, replace your seized drain bolts with our [Genuine Float Bowl Drain Screws] to make future maintenance a breeze. View Drain Screws here.

🔧 Installation Tips

Gentle Hands: Brass is soft. Hand-tighten the nut first to ensure it’s seated before using a tool. Do NOT overtighten.
Clean the Bore: Use carb cleaner to ensure the threads inside the carburettor are free from old fuel gumming before installing the new part.
Inspect the Needle: While the nut is out, check your jet needle for wear or “steps.” If the needle is worn, even a new nut won’t fix a rough mid-range.

📧 FITMENT QUESTIONS? Email us with your carb photos. For community guides on tuning and cleaning your vTwin carbs, visit the HyoRiders Forums.