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Carburettor Carb Pilot Jets x2 – Hyosung GV125 GT125 R RC GV250 GT250

Estimated delivery dates: Aug 19, 2026 - Aug 20, 2026

Price range: £14.99 through £16.99

🛠️ TWIN-CARB PILOT JETS (X2) // FIX ROUGH IDLE & HARD STARTS

Is your bike feeling temperamental when you tick over? Clogged or damaged low-speed fuel nozzles are the main cause of hard starting, rough idling, and poor slow-speed throttle response, making a fresh Hyosung pilot jet kit the smartest way to restore smooth running during a maintenance project.

  • Cure // Restores steady low-end performance and resolves cold engine hesitation bugs instantly.
  • Sizing // We stock the exact factory dimensions needed for your specific 125cc or 250cc engine displacement.
  • Brass // Precision-machined heavy duty material ensures totally accurate fueling pathways inside your bowls.
  • In Stock // Ready for your next carb overhaul. Supplied as a matching pair to cover front and rear carb bodies.
💡 TECH TIP: The tiny internal holes inside the 125cc nozzles can clog up very easily with modern stale fuel. Keeping these openings crystal clean is a crucial part of routine maintenance!
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Description

If your bike is showing active signs of moody running, sluggish throttle response, or a highly erratic tickover speed, your low-speed brass jets are the most likely culprit. You will receive exactly two brand-new, precision-machined internal nozzles to fit both your front and rear chambers. The factory-fitted internal parts are calibrated explicitly for each engine size. Because the smaller engine variant carbs feature highly compressed internal openings, they are significantly more vulnerable to getting blocked by gummy fuel scale and dirt build-up. Regular clean-outs or swapping out a worn Hyosung pilot jet kit will quickly resolve these annoying engine bugs during your next maintenance project.

Keeping your fuel nozzles clean and sized accurately is the hidden secret to enjoying a much smoother throttle take-up and a happier engine overall. This simple, affordable replacement can bring your machine straight back to life if it has been feeling lazy or inconsistent during acceleration on your weekend restoration work.

💎 LOW-SPEED RUNNING HARDWARE HYOSUNG PILOT JET KIT SPECIFICATIONS

Cures Moody IdlingRestores a steady, completely predictable engine speed at low operational RPM limits. Fixes Cold Hard StartsEnsures a steady, unblocked atomised delivery of fuel when starting up from bone cold.
True Factory BlueprintTurned accurately from high-grade brass to replace factory codes: 13365HM7900 or 13365HM8100. Diagram Item Number 60Matches part layout index reference number 60 inside the internal bowl mapping schematics.

📜 Confirmed Fitment Guide (Carburettor Models Only)

Model & Year Verification: Threads and diameters match the specific v-twin carb configurations listed below. See the diagram picture for lower fuel bowl positioning.

  • GT125 / GT125R / GT125RC: All years up to 2020 (Uses Size-15 Pilot Jets).
  • GV125 Aquila / Mirage: Up to 2018 (Uses Size-17.5 Pilot Jets).
  • GT250 / GT250R / GV250: All carb models (Uses Size-20 Pilot Jets).
💡 TUNING BUNDLE WORKSHOP SUGGESTION: Replacing your low-speed nozzles is only half the battle when clearing up old fuel blocks. We highly recommend reviewing our detailed community walkthrough threads to learn how to properly swap your main jet nozzles for optimal tuning results across your project: Tap here for the step-by-step guide on the forums.

🔧 Install Tips

  • Cleanliness is Completely Crucial: Always blast the interior chambers thoroughly with fresh cleaner solution before inserting the new jets. Trapping any microscopic speck of old scaling inside the circuit channel will immediately re-contaminate your fresh hardware.
  • Handle Delicate Brass with Care: Take your time when threading these tiny components into the central internal towers. Brass threads are incredibly soft; always utilize a properly fitting flat screwdriver and snug them down gently without over-torqueing to avoid stripping the holes.
  • Execute a Final System Synchronisation: Once you button your lower bowls back down and remount the assembly, carrying out a clean dual synchronization check along with an air/fuel mixture hole fine-tuning is highly recommended to secure the absolute smoothest power delivery.
📧 NOT SURE HOW TO PROPERLY BALANCE YOUR LOWER IDLE ADJUSTER SCREWS? If your engine is coughing on acceleration or you want to verify your jet sizes before breaking open the package seal, you can upload a crisp photo of your open fuel lines on the forum to get immediate support. For fast sales support, email us your question or if you want to find simple tuning instructions, head straight over to the forums.

Additional information

Weight 0.3 kg
Dimensions 20 × 20 × 2 cm
Bike Model

GT125 & GT125R RC, GV250 & GT250 & GT250R, GV125 Aquila

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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.