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).
🔧 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.












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