Carb Diaphragm [Throttle Slide Piston] – Hyosung GT125R GV250 GT250R GV125
💎 HYOSUNG CARB DIAPHRAGM (THROTTLE SLIDE)
Stop the bogging and bring back the power. These precision-moulded diaphragms restore the vacuum seal required for smooth lifting of the throttle slides. Essential for any carburettor overhaul to fix surging and flat spots.
- ✅ Performance: Eliminates throttle hesitation and inconsistent idling.
- 🛠️ Direct Fit: High-grade rubber slide assembly, built to OEM spec.
- ⚙️ Compatibility: Fits GT125/R, GT250/R, and GV125/250 (Carb Models).
- 📦 What’s Included: Slide Piston & Rubber Diaphragm Assembly
(❌ Needles NOT included).
• 125cc Owners: You receive TWO (2) pieces (Full set for your twin carbs).
• 250cc Owners: You receive ONE (1) piece (Order Qty 2 if you need both).
Description
After years of exposure to modern ethanol-blended fuels and engine heat, original Hyosung diaphragms become brittle or develop pin-sized tears. This “Maintenance Reality” means your slides won’t lift evenly, causing the bike to feel “lazy” or bog down under load. Replacing these is the most cost-effective way to restore that factory-fresh throttle snap.
💎 Precision Metering, Maximum Performance
A healthy diaphragm ensures the air-fuel mixture remains consistent across the entire rev range.
| Fix Surging Ensures stable vacuum for steady cruising. |
Stop Bogging Provides instant slide lift when you pin it. |
| OEM Replacement References 13338HG5100 specifications. |
Better Mileage Proper fuel metering prevents “over-rich” running. |
📜 Confirmed Fitment Guide
📅 YEARS: All Carburettor models (GV125 up to 2017).
⚠️ NOTE: Needles are not included. Reuse your existing needles or check our shop for upgrades.
Don’t let rusty bolts ruin your rebuild! Pair these with our Stainless Steel Carb Screw Kits to ensure easy maintenance in the future. View Carb Spares here.
🔧 Install Tips
- Cleanliness is Key: Thoroughly clean the carb body and slide grooves with carb cleaner before fitting the new rubber.
- Seating: Ensure the lip of the diaphragm is perfectly seated in the groove before tightening the top cap to avoid air leaks.
- Spring Check: Inspect your slide springs for corrosion while the tops are off!
- Guide: Need a walkthrough? Check the HyoRiders Tutorial Section.
📧 FITMENT QUESTIONS? Email us with your bike details. For technical help, visit the HyoRiders Forums.
Additional information
| Weight | 0.9 kg |
|---|---|
| Dimensions | 20 × 20 × 20 cm |
1 review for Carb Diaphragm [Throttle Slide Piston] – Hyosung GT125R GV250 GT250R GV125
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Your Hyosung parts hub genuine & aftermarket parts + upgrades with UK & worldwide shipping.
Ryan (verified owner) –
If you’re looking to improve your 6-7k rpm I would highly recommend this along with the needle that can also be found on this site. I had boggy type issues and after installing this and the needle it’s gone completely, very easy to install 10/10, great help from Marcel too answering all my questions when needed, top guy!